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#1
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Unusual Power supply problem
I have a very unusual problem with my power supply that I or noone
else can figure out. here goes; My wife's computer-motherboard and power supply and cdrom stopped working I assume some type of surge. I replaced her motherboard and used a power supply from my computer and got her up and running. No problems her computer started up right away. I then bought a new power supply for my computer and installed it. No problem light on M/B was on but computer would not start up. I tried checking switch wires etc... and all connections no luck. I thought maybe the power supply was defective. I even tried it into my wifes computer and it did not work. I then bought a new power supply and the same thing happened, it got power but would not start. I tried it in both computers and no luck. I then switched the power supply from my wifes computer(my original) and my computer started right up. To sum it up, my original supply works in both my computer and my wifes. I then tried 2 new supplies which did not work in either computers. Any help would be appreciated. I am lost. Thanks, Mike |
#2
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Sure your PSU have enough capacity meaning are they at leas of the same
amount of Watts as the old one, as if not sufficiently powerfull, then very likely they don't allow you to boot (because they cant deliver the peak current required for the booting). Also watch out which PSU you buy, there are very cheap ones which are working, but that's about it, not to say they are crap and will make your PC unstable and all the like, so buy a brand which is not the cheapest and has decent values of +5 and +12V current supplies, all of this depends on the HW of your system, which you don't seem to mention mike wrote: I have a very unusual problem with my power supply that I or noone else can figure out. here goes; My wife's computer-motherboard and power supply and cdrom stopped working I assume some type of surge. I replaced her motherboard and used a power supply from my computer and got her up and running. No problems her computer started up right away. I then bought a new power supply for my computer and installed it. No problem light on M/B was on but computer would not start up. I tried checking switch wires etc... and all connections no luck. I thought maybe the power supply was defective. I even tried it into my wifes computer and it did not work. I then bought a new power supply and the same thing happened, it got power but would not start. I tried it in both computers and no luck. I then switched the power supply from my wifes computer(my original) and my computer started right up. To sum it up, my original supply works in both my computer and my wifes. I then tried 2 new supplies which did not work in either computers. Any help would be appreciated. I am lost. Thanks, Mike |
#4
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To clear up some questions you have, the power supply that is not
working is a 550w achieve. It gets a green light on M/B but will not power up. I read the post that was referred in reply but it was not clear to me on how to troubleshoot. if someone can direct me to another location or site that explains it more clearer. it is a little frustating because i do not know anything about how to diagnose the problem. It is also strange that the power supply does not work in both of my computers. I have a feeling that the problem is something minor and when i figure it out i will be slapping myself in the head. Please keep the suggestions coming. I really appreciate the assistance. Thanks, Mike (w_tom) wrote in message . com... Same procedure reports what of three subsystem components is / is not working. Takes but minutes to get necessary information if you come equipted with necessary tool (3.5 digit multimeter) and knowledge. Procedure may be found in "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q using voltages in table: Voltage Wire Color Min V Max V +5 V Red 4.75 V 5.25 V +12 V Yellow 11.4 V 12.6 V +3.3 V Orange 3.135 V 3.465 V +5VSB Purple 4.75 5.25 !Power On Green 0.8 2.0 Power OK Gray 2.4 when power is good or in "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa With numerical data, then reason for problem is isolated to motherboard, power supply, or power switch. Or the power supply subsystem is found to be OK meaning we move on to other 'usual' suspects. (mike) wrote in message . com... I have a very unusual problem with my power supply that I or noone else can figure out. here goes; My wife's computer-motherboard and power supply and cdrom stopped working I assume some type of surge. I replaced her motherboard and used a power supply from my computer and got her up and running. No problems her computer started up right away. I then bought a new power supply for my computer and installed it. No problem light on M/B was on but computer would not start up. I tried checking switch wires etc... and all connections no luck. I thought maybe the power supply was defective. I even tried it into my wifes computer and it did not work. I then bought a new power supply and the same thing happened, it got power but would not start. I tried it in both computers and no luck. I then switched the power supply from my wifes computer(my original) and my computer started right up. To sum it up, my original supply works in both my computer and my wifes. I then tried 2 new supplies which did not work in either computers. Any help would be appreciated. I am lost. Thanks, Mike |
#5
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Diagnosis procedure is in both newsgroup discussions. Both are chock
full of information which means it must be read multiple times before it makes sense. Your solution starts with that all so essential 3.5 digit multimeter. Buy it. Don't even ask why. Just buy it to solve electrical problems. Green light does not even say that power supply is outputting (sufficient) voltage. Green light tells us nothing. Until multimeter and information in those other posts is used, then no one can provide useful informaton to solve your problem. BTW, you did remove all power cords from wall before changing anything - right? If not, then further damage could have resulted. Don't understand why you provided that 550w number. It tells us nothing. Again, provided are charts with upper and lower limits. Get a meter to compare measured numbers to numbers in chart. Furthermore, 550w implies the person who bought power supplies is computer illiterate. The computer should be working just fine with a 250w power supply. To hype their inferior product, then many clone power supply manufacturers even inflate that wattage number to 500+ - rather than sell a supply with other essential functions. To sell on price, they simply forget to include those other essential functions. Your power supply is either more than too large - or has serious problems. Either way, the multimeter would have discovered the problem and made a solution simple. Get the meter. Follow those already cited diagnostic procedures at http://www.tinyurl.com/2musa or http://tinyurl.com/2t69q (mike) wrote in message . com... To clear up some questions you have, the power supply that is not working is a 550w achieve. It gets a green light on M/B but will not power up. I read the post that was referred in reply but it was not clear to me on how to troubleshoot. if someone can direct me to another location or site that explains it more clearer. it is a little frustating because i do not know anything about how to diagnose the problem. It is also strange that the power supply does not work in both of my computers. I have a feeling that the problem is something minor and when i figure it out i will be slapping myself in the head. |
#6
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(mike) wrote in message . com...
To clear up some questions you have, the power supply that is not working is a 550w achieve. It gets a green light on M/B but will not power up. I read the post that was referred in reply but it was not clear to me on how to troubleshoot. if someone can direct me to another location or site that explains it more clearer. it is a little frustating because i do not know anything about how to diagnose the problem. It is also strange that the power supply does not work in both of my computers. I have a feeling that the problem is something minor and when i figure it out i will be slapping myself in the head. Please keep the suggestions coming. I really appreciate the assistance. Thanks, Mike (w_tom) wrote in message . com... Same procedure reports what of three subsystem components is / is not working. Takes but minutes to get necessary information if you come equipted with necessary tool (3.5 digit multimeter) and knowledge. Procedure may be found in "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q using voltages in table: Voltage Wire Color Min V Max V +5 V Red 4.75 V 5.25 V +12 V Yellow 11.4 V 12.6 V +3.3 V Orange 3.135 V 3.465 V +5VSB Purple 4.75 5.25 !Power On Green 0.8 2.0 Power OK Gray 2.4 when power is good or in "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa With numerical data, then reason for problem is isolated to motherboard, power supply, or power switch. Or the power supply subsystem is found to be OK meaning we move on to other 'usual' suspects. Here is what the power plug pinout should look like clip that holds the Power Supply connector on is in this direction "-" the pin layout/voltages should be as follows 12V : 5V 5VSB : 5V PW-OK: -5V GND : GND 5V : GND GND : GND 5V : PS-ON - GND : GND 3.3V : -12V 3.3V : 3.3V hope this helps |
#7
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(jamotto) wrote in message om...
(mike) wrote in message . com... To clear up some questions you have, the power supply that is not working is a 550w achieve. It gets a green light on M/B but will not power up. I read the post that was referred in reply but it was not clear to me on how to troubleshoot. if someone can direct me to another location or site that explains it more clearer. it is a little frustating because i do not know anything about how to diagnose the problem. It is also strange that the power supply does I tested the power supply with the multimeter and the only reading I got is with the purple wire which fell within the range of 4.75 to 5.25. I did not get any reading from any of the other pin's. not work in both of my computers. I have a feeling that the problem is something minor and when i figure it out i will be slapping myself in the head. Please keep the suggestions coming. I really appreciate the assistance. Thanks, Mike (w_tom) wrote in message . com... Same procedure reports what of three subsystem components is / is not working. Takes but minutes to get necessary information if you come equipted with necessary tool (3.5 digit multimeter) and knowledge. Procedure may be found in "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q using voltages in table: Voltage Wire Color Min V Max V +5 V Red 4.75 V 5.25 V +12 V Yellow 11.4 V 12.6 V +3.3 V Orange 3.135 V 3.465 V +5VSB Purple 4.75 5.25 !Power On Green 0.8 2.0 Power OK Gray 2.4 when power is good or in "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa With numerical data, then reason for problem is isolated to motherboard, power supply, or power switch. Or the power supply subsystem is found to be OK meaning we move on to other 'usual' suspects. Here is what the power plug pinout should look like clip that holds the Power Supply connector on is in this direction "-" the pin layout/voltages should be as follows 12V : 5V 5VSB : 5V PW-OK: -5V GND : GND 5V : GND GND : GND 5V : PS-ON - GND : GND 3.3V : -12V 3.3V : 3.3V hope this helps |
#8
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The green wire also tested at just about 3.0. displayed below said the
max should be 2.0. Hope this and previous post will give more insight. None of the other pins gave any reading on meter. (jamotto) wrote in message om... (mike) wrote in message . com... To clear up some questions you have, the power supply that is not working is a 550w achieve. It gets a green light on M/B but will not power up. I read the post that was referred in reply but it was not clear to me on how to troubleshoot. if someone can direct me to another location or site that explains it more clearer. it is a little frustating because i do not know anything about how to diagnose the problem. It is also strange that the power supply does not work in both of my computers. I have a feeling that the problem is something minor and when i figure it out i will be slapping myself in the head. Please keep the suggestions coming. I really appreciate the assistance. Thanks, Mike (w_tom) wrote in message . com... Same procedure reports what of three subsystem components is / is not working. Takes but minutes to get necessary information if you come equipted with necessary tool (3.5 digit multimeter) and knowledge. Procedure may be found in "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q using voltages in table: Voltage Wire Color Min V Max V +5 V Red 4.75 V 5.25 V +12 V Yellow 11.4 V 12.6 V +3.3 V Orange 3.135 V 3.465 V +5VSB Purple 4.75 5.25 !Power On Green 0.8 2.0 Power OK Gray 2.4 when power is good or in "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa With numerical data, then reason for problem is isolated to motherboard, power supply, or power switch. Or the power supply subsystem is found to be OK meaning we move on to other 'usual' suspects. Here is what the power plug pinout should look like clip that holds the Power Supply connector on is in this direction "-" the pin layout/voltages should be as follows 12V : 5V 5VSB : 5V PW-OK: -5V GND : GND 5V : GND GND : GND 5V : PS-ON - GND : GND 3.3V : -12V 3.3V : 3.3V hope this helps |
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