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#1
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PC power on - start, stop, start, stop, etc - eventually powers up
Hi all,
I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. I've got a P4 3.0GHz PC with an Asis P4P800S-X board, 512mb RAM, Thermaltake 430W PSU and geforece fx5200 graphics. The problem is that once the system is warm (and sometimes even from cold) a shutdown then start gets the computer spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Sometimes the brief power ons result in the drives starting to power up as well, but usually not. I've flashed the motherboard, replaced the PSU, cleaned and reattached the HSF, and tried it with only CPU, GPU, RAM, and Video attached to the motherboard without success in solving this issue. I've come accross other accounts of similar issues, but they've usually been solved by the steps I've already taken. Any ideas on where I could go from here? TIA, Ari -- spammage trappage: remove the underscores to reply Many people around the world are waiting for a marrow transplant. Please volunteer to be a marrow donor and literally save someone's life: http://www.abmdr.org.au/ http://www.marrow.org/ |
#2
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PC power on - start, stop, start, stop, etc - eventually powers up
"spodosaurus" wrote in message ... Hi all, I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. I've got a P4 3.0GHz PC with an Asis P4P800S-X board, 512mb RAM, Thermaltake 430W PSU and geforece fx5200 graphics. The problem is that once the system is warm (and sometimes even from cold) a shutdown then start gets the computer spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Sometimes the brief power ons result in the drives starting to power up as well, but usually not. I've flashed the motherboard, replaced the PSU, cleaned and reattached the HSF, and tried it with only CPU, GPU, RAM, and Video attached to the motherboard without success in solving this issue. I've come accross other accounts of similar issues, but they've usually been solved by the steps I've already taken. Any ideas on where I could go from here? TIA, Ari -- Fans spinning up and system not posting is a classic symtom of a failed or failing power supply. If you are sure your replacement PSU is good, it could be a number of things including CPU and MB. Ed |
#3
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PC power on - start, stop, start, stop, etc - eventually powersup
Ed Medlin wrote:
"spodosaurus" wrote in message ... Hi all, I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. I've got a P4 3.0GHz PC with an Asis P4P800S-X board, 512mb RAM, Thermaltake 430W PSU and geforece fx5200 graphics. The problem is that once the system is warm (and sometimes even from cold) a shutdown then start gets the computer spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Sometimes the brief power ons result in the drives starting to power up as well, but usually not. I've flashed the motherboard, replaced the PSU, cleaned and reattached the HSF, and tried it with only CPU, GPU, RAM, and Video attached to the motherboard without success in solving this issue. I've come accross other accounts of similar issues, but they've usually been solved by the steps I've already taken. Any ideas on where I could go from here? TIA, Ari -- Fans spinning up and system not posting is a classic symtom of a failed or failing power supply. If you are sure your replacement PSU is good, it could be a number of things including CPU and MB. Ed At this point I'm guessing it has to be motherboard. The install and updating of ubuntu went perfectly. it still runs perfectly - when it actually gets to POST. -- spammage trappage: remove the underscores to reply Many people around the world are waiting for a marrow transplant. Please volunteer to be a marrow donor and literally save someone's life: http://www.abmdr.org.au/ http://www.marrow.org/ |
#4
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PC power on - start, stop, start, stop, etc - eventually powers up
spodosaurus wrote:
Hi all, I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. I've got a P4 3.0GHz PC with an Asis P4P800S-X board, 512mb RAM, Thermaltake 430W PSU and geforece fx5200 graphics. The problem is that once the system is warm (and sometimes even from cold) a shutdown then start gets the computer spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Sometimes the brief power ons result in the drives starting to power up as well, but usually not. I've flashed the motherboard, replaced the PSU, cleaned and reattached the HSF, and tried it with only CPU, GPU, RAM, and Video attached to the motherboard without success in solving this issue. I've come accross other accounts of similar issues, but they've usually been solved by the steps I've already taken. Any ideas on where I could go from here? TIA, Ari Possibly marginal available power at boot? You didn't say how many hard drives are connected: try with only one. Also try without the video card installed. Watching the power supply voltages during the boot might help. |
#5
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PC power on - start, stop, start, stop, etc - eventually powersup
Bryce wrote:
spodosaurus wrote: Hi all, I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. I've got a P4 3.0GHz PC with an Asis P4P800S-X board, 512mb RAM, Thermaltake 430W PSU and geforece fx5200 graphics. The problem is that once the system is warm (and sometimes even from cold) a shutdown then start gets the computer spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Sometimes the brief power ons result in the drives starting to power up as well, but usually not. I've flashed the motherboard, replaced the PSU, cleaned and reattached the HSF, and tried it with only CPU, GPU, RAM, and Video attached to the motherboard without success in solving this issue. I've come accross other accounts of similar issues, but they've usually been solved by the steps I've already taken. Any ideas on where I could go from here? TIA, Ari Possibly marginal available power at boot? Doesn't even make it through post, much less all the way to boot. However, sometimes, like right now, it went through POST and boot and is working fine - if I restart it, though... You didn't say how many hard drives are connected: try with only one. I said above that I've tried it with the bare minimum: motherboard with only RAM, CPU, and video card. There's only one HDD attached when in use, however. Also try without the video card installed. Watching the power supply voltages during the boot might help. I guess I can always give that a try. Without the graphics card it'll just beep. -- spammage trappage: remove the underscores to reply Many people around the world are waiting for a marrow transplant. Please volunteer to be a marrow donor and literally save someone's life: http://www.abmdr.org.au/ http://www.marrow.org/ |
#6
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PC power on - start, stop, start, stop, etc - eventually powersup
On Dec 26, 9:58*am, Bryce wrote:
Possibly marginal available power at boot? *You didn't say how many hard drives are connected: try with only one. If one or four hard drives made a difference, then the power supply is grossly undersized even with zero drives. And the multimeter would have made that obvious even with zero drives connected. But again, 'it might be hard drives' is another perfect example of shotgunning - this time without basic knowledge of how computer power supplies work. Disk drives do not even make a list of responsible speculation - which would have been obvious had that reply come with some numbers such as the power consumption by a disk drive. No numbers; therefore wild and not useful speculation. |
#7
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PC power on - start, stop, start, stop, etc - eventually powersup
On Dec 26, 7:03*am, spodosaurus wrote:
I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. ... once the system is warm (and sometimes even from cold) a shutdown then start gets the compute spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Fans spinning up and system not posting is a classic symtom of a failed or failing power supply. Also a failing power supply controller. Also a video controller problem, etc. Most things replaced and swapped would not address those symptoms and are classicshotgunning. In some cases, if it fixed failure, it really only cured symptoms. First establish what is and is not working. That means numbers and simpler facts. Havinig swapped a power supply, nobody still knows if either power supply is good or bad. Swapping determined nothing useful. A perfectly good supply can be defective in another machine. And a perfectly defective power supply can boot another computer. Without numbers from a supply when powered off and as powering on, then nobody knows if the power supply is good. With VDC numbers from a 3.5 digit multimter, then a power supply's state is known AND in seconds, also known is other power supply 'system' components such as the supply controller and power switching. By wildly speculating, a most likely reason for failure is a power supply controller. Without numbers, every answer will only be speculation. Measure VDC on the green, gray, and purple wires (power supply to motherboard) both before and when switch is pressed. Record those numbers. Once the system does boot, measure VDC numbers from any one of red, orange, and yellow wires. Only with numbers can we eliminate power supply, its controller and other power supply system components from the list of suspects. Only then do we have something on a list of accomplishments. Only then move on to other potential problems. Only then has labor provided numbers so that others can reply with useful assistance. Most items 'fixed' may have been eliminated immediately in the minute a multimeter was learning numbers. Get the mulitmeter so that a next reply is informative. |
#9
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PC power on - start, stop, start, stop, etc - eventually powersup
On Dec 27, 5:55*am, spodosaurus wrote:
My voltages were all within 5% of nominal voltages on both PSUs - I tested these before I did anything else. I had a PSU test okay with my digital multimeter before, but there were fluctuations on the +5VSB line that were causing problems that were only detected by a PSU tester that was inaccurate and only reported to one decimal place, but it did update frequently enough that I could see the +5VSB fluctuations. Just in case there was a +5VSB issue, I switch the rear usb power from that line to +5V using the motherboard's jumpers without success. Your specs -5% - are an ATX spec but are not correct for what is measured. Post those numbers here because being inside another spec is only one part of information in those numbers. If a power supply test (near zero load) detected a problem, then removing a near zero load (USB) also accomplishes nothing. When the +5VSB is connected to a load (motherboard), what does the multimeter actually read? |
#10
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PC power on - start, stop, start, stop, etc - eventually powers up
On Fri, 26 Dec 2008 21:03:22 +0900, spodosaurus
put finger to keyboard and composed: Hi all, I have a problem that has only recently started (to my knowledge) and I can't seem to solve it. I've got a P4 3.0GHz PC with an Asis P4P800S-X board, 512mb RAM, Thermaltake 430W PSU and geforece fx5200 graphics. The problem is that once the system is warm (and sometimes even from cold) a shutdown then start gets the computer spinning its fans, powering off, spinning fans, powering off, and repeating this cycle from 1-10+ times before actually POSTing. Once it POSTs, it's all fine. Sometimes the brief power ons result in the drives starting to power up as well, but usually not. I've flashed the motherboard, replaced the PSU, cleaned and reattached the HSF, and tried it with only CPU, GPU, RAM, and Video attached to the motherboard without success in solving this issue. I've come accross other accounts of similar issues, but they've usually been solved by the steps I've already taken. Any ideas on where I could go from here? TIA, Ari It may be instructive if you can determine whether it is the motherboard that is turning the PSU off in response to a fault condition, or whether it is the PSU that is turning itself off in response to a fault in the load. Or it may be that the motherboard is resetting itself for some reason without turning off the PSU. To this end it *might* help if you monitored the PS_ON signal (pin 14, green) with a multimeter. A DMM may not detect rapid transitions on this pin, though, even with a peak hold function. See http://pinouts.ru/Power/atxpower_pinout.shtml Does the PSU fan stop spinning, or is it only the motherboard fans that do this? Have you tried replacing your graphics card with a low power PCI card? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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