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Compaq power supply failure
The box I use at home is a Pentium II Compaq full tower (built like a
tank and weighs like one). Outdated as it is, it runs fine with Windows 2000 pro SP4, with all programs such as Nero 6, Firefox 2 etc. It recently began this problem of every now and then not turning on when the ON button is pressed. However, sometimes it would turn on several minutes afterwards. I'd been suspecting something wrong with power supply all along. A couple of days ago it turned on after a long delay (one hour or so after I'd pushed the ON button. But no memory check, no booting, nothing. The monitor was not receiving any signal. Plus, the POWER ON indicator was blinking (2 seconds on - 2 seconds off -2 seconds on etc). I turned it off. Now whenever I turn it on, it comes on (fans running, LEDs on but that's all: no booting. It seems power reaches the devices (I tried ejecting CD, it responds fine). Could it means I've lost the power supply? strange, considering that the system powers up convincingly, with all fans (Processor and Power Supply) running and LEDs lighting up. Anyone came across this? please assist. |
#2
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Compaq power supply failure
"Dan" wrote in message
ups.com... The box I use at home is a Pentium II Compaq full tower (built like a tank and weighs like one). Outdated as it is, it runs fine with Windows 2000 pro SP4, with all programs such as Nero 6, Firefox 2 etc. It recently began this problem of every now and then not turning on when the ON button is pressed. However, sometimes it would turn on several minutes afterwards. I'd been suspecting something wrong with power supply all along. A couple of days ago it turned on after a long delay (one hour or so after I'd pushed the ON button. But no memory check, no booting, nothing. The monitor was not receiving any signal. Plus, the POWER ON indicator was blinking (2 seconds on - 2 seconds off -2 seconds on etc). I turned it off. Now whenever I turn it on, it comes on (fans running, LEDs on but that's all: no booting. It seems power reaches the devices (I tried ejecting CD, it responds fine). Could it means I've lost the power supply? strange, considering that the system powers up convincingly, with all fans (Processor and Power Supply) running and LEDs lighting up. Anyone came across this? please assist. I'd agree with you that it's the PS. The PS supplies different voltages through the mb; and although you may have minimum necessary voltage and current to peripherals the necessary voltage to parts on the mb may be insufficient. The way to be sure of this is to use a voltmeter and check the voltages from the PS while the PS is under a load; perhaps just attaching it to an old hard drive while reading those voltages that you should have. Most likely what has been happening is that there is a leaky capaciter not charging for necessary voltage. The more you tried it in its early stages the more the cap heated and expanded to stop the leak and build the voltage, but as time continued the leak just kept getting bigger and at this point it's leaking more than the heat variable can hold the electrolyte to supply the voltage. See if you can substitute another PS before you immediately run out to replace yours. It's possible that that the one Compaq supplied is propriatory and a generic one will not have the correct connectors. If that's the case it becomes questionable if the price it will cost for the replacement is worth it to keep your system running for another year before you decide to replace the whole rig. -- Jan Alter or |
#3
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Compaq power supply failure
Dan wrote: The box I use at home is a Pentium II Compaq full tower (built like a tank and weighs like one). Outdated as it is, it runs fine with Windows 2000 pro SP4, with all programs such as Nero 6, Firefox 2 etc. It recently began this problem of every now and then not turning on when the ON button is pressed. However, sometimes it would turn on several minutes afterwards. I'd been suspecting something wrong with power supply all along. A couple of days ago it turned on after a long delay (one hour or so after I'd pushed the ON button. But no memory check, no booting, nothing. The monitor was not receiving any signal. Plus, the POWER ON indicator was blinking (2 seconds on - 2 seconds off -2 seconds on etc). I turned it off. Now whenever I turn it on, it comes on (fans running, LEDs on but that's all: no booting. It seems power reaches the devices (I tried ejecting CD, it responds fine). Could it means I've lost the power supply? strange, considering that the system powers up convincingly, with all fans (Processor and Power Supply) running and LEDs lighting up. Anyone came across this? please assist. Obviously I don't know where you live but here, in TX, I often find 'garage sale' computers in the $10.00 - $20.00 price range and have actually had a situation recently where the box I bought had a dead power supply and I replaced it with a power supply from a box that had been gutted, except for the PS and left out for the trash man. You need to check the plug-in to the motherboard. I don't think there are many different types of plug, so its not rocket science. Then again, are new one is not a great expense. |
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Compaq power supply failure
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#5
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Compaq power supply failure
The point made about the propriaty power supply could be relevant in that it is not the connectors physical look that is different but the way that it is wired. km where's that spellchecker gone? km |
#6
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Compaq power supply failure
On Mon, 13 Nov 2006 08:06:18 +0000, km wrote:
The point made about the propriaty power supply could be relevant in that it is not the connectors physical look that is different but the way that it is wired. I can't claim to have seen ALL Compaqs from that era, but in general they did use standard ATX PSU except for a few smaller form factor units that had what looked more like a retrofitted AT pair of (single row) connectors. I'd suspect power supply, motherboard battery, motherboard capacitors. Clearing CMOS is the first try. |
#7
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Compaq power supply failure
The machine doesn't get anywhere near executing cmos. No signal ever
goes to the display, no beep codes, nothing. Only that power on LED lights (first day it was blinking, thereafter it lights continuously). The IDE light also comes on when the ON button is pushed, then goes off after 10 seconds or so. The PSU fan is running. I visited HP web, but the info given there about PSU fix is not helpful at all (such as telling me to go try another wall outlet ha-ha) Motherboard power supply looks like ATX: I haven't yanked it out to count the pins, but I suspect it wouldn't be same as generic ATX. Plus wiring could be different as someone has noted before. The power supply is huge, with enough 5/12 rails to power 6 or so ide devices, although I've been using just one HD and one CDRW--and one dormant floppy drive. I therefore don't think it is the case of overload. kony wrote: On Mon, 13 Nov 2006 08:06:18 +0000, km wrote: The point made about the propriaty power supply could be relevant in that it is not the connectors physical look that is different but the way that it is wired. I can't claim to have seen ALL Compaqs from that era, but in general they did use standard ATX PSU except for a few smaller form factor units that had what looked more like a retrofitted AT pair of (single row) connectors. I'd suspect power supply, motherboard battery, motherboard capacitors. Clearing CMOS is the first try. |
#8
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Compaq power supply failure
On 16 Nov 2006 05:53:07 -0800, "Dan"
wrote: The machine doesn't get anywhere near executing cmos. No signal ever goes to the display, no beep codes, nothing. Only that power on LED lights (first day it was blinking, thereafter it lights continuously). The IDE light also comes on when the ON button is pushed, then goes off after 10 seconds or so. The PSU fan is running. I visited HP web, but the info given there about PSU fix is not helpful at all (such as telling me to go try another wall outlet ha-ha) Motherboard power supply looks like ATX: I haven't yanked it out to count the pins, but I suspect it wouldn't be same as generic ATX. Plus wiring could be different as someone has noted before. Why suspect it wouldn't be the same? If it looks like ATX, odds are it is. Dell was the OEM notorious for using an ATX connector with non-ATX pinout, not HP or Compaq. That doesn't necessarily mean it has a standard ATX case (dimensions), some older HP were a shorter form factor with the same rear face dimensions but not as long. Either way, measuring the case dimensions and noting the connector wire colors should indicate what is needed to replace it (if that's the problem). The power supply is huge, Define huge. with enough 5/12 rails to power 6 or so ide devices, although I've been using just one HD and one CDRW--and one dormant floppy drive. I therefore don't think it is the case of overload. # of plugs doesn't necesarily mean anything, and at this point it's not a matter of initial capacity, it's a matter of whether the part has failed. Everything fails, eventually... now it's just a matter of figuring out what has gone wrong. |
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