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#41
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2x mbs tried, in case and out of case, with case connectors and w/o
have now successfully flashed the bios to latest version using a dos rather than windows app system does not die in bios. technically, it is not rebooting but simply powering off instantly. "Overlord" wrote in message ... So basically you've tried replacing or disconnecting everything but the MB, right? Chances are vanishingly remote that it's a BIOS virus but... have you tried flashing to an Older bios since you can't flash to a newer bios? Will the system reboot sitting in the BIOS screens? If you have NO hard drive in the system, will the system POST, nag you about having no OS, sit a while and then reboot? Have you tried also disconnecting your case fans? And are you using the same HS/fan for both CPUs? Is the MB correctly grounded at the right points by the mounting screws? Since you haven't, apparently, swapped motherboards.... yet, make sure there is nothing between the back of the MB and the case. You might also consider pulling the MB and booting it on a foam block |
#42
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battery on both mbs appear fine. one is brand new.
"Jonathan Starr" wrote in message ... Hi, I have had a look through this thread but no one seems to have mentioned the CMOS battery. I had a brand new motherboard that had these exact symptoms, I tried everything but nothing made a difference not even buying a top of the range 'PC power and cooling' power supply rated for huge servers. I was so sure it was a power issue that I didn't bother checking the CMOS battery, it was brand new motherboard so the battery had to be fine... Sure enough the battery was low (but not that low) and replacing it cured the problem completely just like that. It was a co-worker that suggested changing it BTW, I probably would have never even checked it left to myself and would have probably sent the board back. It doesn't seem to be an uncommon problem either after asking people I know, although most motherboards just forget their settings at every boot rather than just re-setting randomly. Best of luck with it, -Jon |
#43
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"Nick G" ignore @ nospam.com wrote in message ...
The following problem has confounded every IT friend and support person i have presented it to and appears to defy logic so i am throwing it to a broader audience of experts to see if it elicits some ideas. Thanks in advance for considering it and apologies for cross-group posting! Problem: Spontaneous power-offs that take place between 15 seconds and 30 minutes after booting. As if the power cord was yanked out of the back. Green M/B LED remains on, power cord has to be disconnected for several seconds before re-boot can take place. PC background: home-built 18 months ago, ran fine until last week. I have been building PCs for 15 years and have spent the last week running through every permutation of test i can think of, to no avail. Components tested (all of which have, in every configuration, replicated the problem): M/B Asus a7v333 latest bios Asus a7v8x-x v06 bios - rejects flash to latest 08 bios temp problem? No. M/B temp under 35 degrees c at time of power-down (have been staring at PC probe's temp montitor as it has gone down on 2 occasions. Immediate boot-ups after power-down reveal no discrepancies in bios-based temp monitor i.e. also reports 35 degrees c or under) CPU AMD Athlon 2100+ AMD Athlon 2500+ temp problem? No CPU temp under 40 degrees c at time of power-down (have been staring at PC probe's temp montitor as it has gone down on 2 occasions. Immediate boot-ups after power-down reveal no discrepancies in bios-based temp monitor i.e. also reports 40 degrees c or under). Bios-based auto-shutdown set at 95 degrees c HD 8GB Seagate- freshly fdisked/formatted but fails to complete winXp install (lasts between 15mins and 25 mins) before powering off 20GB IBM- Win98SE - exhibits power-down symptoms every time, works fine on other machines. Lasts the longest time, up to 30 mins, running in 640x480 res 80GB Maxtor - Win Xp Home - lasts the shortest time, rarely more than 15 minutes, power-offs can happen without any apps running but tends to happen within a few seconds of 3Dmark03 running and within 15 minutes of Norton AV2K4 running Software problem? No. problem replicated with winxp install on fresh disk. Also run each HD in isolation to others, i.e. with no other no HD IDE/power connections Graphics Radeon 9800pro - exhibits power-down symptoms every time, works fine on other machines Radeon 9700 Pro exhibits power-down symptoms every time, works fine on other machines GeForce Ti4600 - exhibits power-down symptoms every time, works fine on other machines Graphics card problem? maybe, but three different cards have replicated the problem. Run with default VGA drivers and latest drivers Memory 512Mb PC2700 Apacer CL2.5 512MB PC3200 Infineon CL 2.5 Memory problem? maybe, replicated with both DIMMS though. Could it be a voltage issue? everything set to default in bios and no voltage setting tampered with at any stage. PSU 300W unbranded, came with case 400W high quality, multi-fan Power problem? Dont know. the brand new 400w PSU immediately replicated the problem. Have tried 4 different power cords in two houses on 5 different sockets (!). All replicated the problem. Others: case - generic, have tried running the pc out of the case without any case jumper connections or any other connections other than PSU housing, using screwdriver to boot. CD, DVD, Floppy, Soundcard, USB expansion card, game card expansion, other USB connections - taken out/disonnected (ide, power etc) but problem still exists I have even tried, once an app is running, diconnecting mouse, keyboard and monitor (!!) with the problem still taking place. I have effectively changed PC entirely with these tests and still get this problem! One idea that was thrown out was a bios-residing virus. is there such a thing (i cannot find mention of one anywhere let alone scanning or removal methods)? Does anyone have any other ideas? Any help very much appreciated Nick ps Please post reply (e-mail address is false) Have you tried downloading distro of linux Knoppix for example that can be run from a cd. See if you can replicate the problem under linux. I'm thinking this might be a problem with power management APM/ACPI in the bios. You also said you could not update the bios most of the newer bios have a flash protection that you have to disable to flash the bios. hope this helps |
#44
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"Nick G" ignore @ nospam.com wrote in message
... The following problem has confounded every IT friend and support person i have presented it to and appears to defy logic so i am throwing it to a broader audience of experts to see if it elicits some ideas. Thanks in advance for considering it and apologies for cross-group posting! Problem: Spontaneous power-offs that take place between 15 seconds and 30 minutes after booting. As if the power cord was yanked out of the back. Green M/B LED remains on, power cord has to be disconnected for several seconds before re-boot can take place. PC background: home-built 18 months ago, ran fine until last week. I have been building PCs for 15 years and have spent the last week running through every permutation of test i can think of, to no avail. Components tested (all of which have, in every configuration, replicated the problem): M/B Asus a7v333 latest bios Asus a7v8x-x v06 bios - rejects flash to latest 08 bios temp problem? No. M/B temp under 35 degrees c at time of power-down (have been staring at PC probe's temp montitor as it has gone down on 2 occasions. Immediate boot-ups after power-down reveal no discrepancies in bios-based temp monitor i.e. also reports 35 degrees c or under) CPU AMD Athlon 2100+ AMD Athlon 2500+ temp problem? No CPU temp under 40 degrees c at time of power-down (have been staring at PC probe's temp montitor as it has gone down on 2 occasions. Immediate boot-ups after power-down reveal no discrepancies in bios-based temp monitor i.e. also reports 40 degrees c or under). Bios-based auto-shutdown set at 95 degrees c HD 8GB Seagate- freshly fdisked/formatted but fails to complete winXp install (lasts between 15mins and 25 mins) before powering off 20GB IBM- Win98SE - exhibits power-down symptoms every time, works fine on other machines. Lasts the longest time, up to 30 mins, running in 640x480 res 80GB Maxtor - Win Xp Home - lasts the shortest time, rarely more than 15 minutes, power-offs can happen without any apps running but tends to happen within a few seconds of 3Dmark03 running and within 15 minutes of Norton AV2K4 running Software problem? No. problem replicated with winxp install on fresh disk. Also run each HD in isolation to others, i.e. with no other no HD IDE/power connections Graphics Radeon 9800pro - exhibits power-down symptoms every time, works fine on other machines Radeon 9700 Pro exhibits power-down symptoms every time, works fine on other machines GeForce Ti4600 - exhibits power-down symptoms every time, works fine on other machines Graphics card problem? maybe, but three different cards have replicated the problem. Run with default VGA drivers and latest drivers Memory 512Mb PC2700 Apacer CL2.5 512MB PC3200 Infineon CL 2.5 Memory problem? maybe, replicated with both DIMMS though. Could it be a voltage issue? everything set to default in bios and no voltage setting tampered with at any stage. PSU 300W unbranded, came with case 400W high quality, multi-fan Power problem? Dont know. the brand new 400w PSU immediately replicated the problem. Have tried 4 different power cords in two houses on 5 different sockets (!). All replicated the problem. Others: case - generic, have tried running the pc out of the case without any case jumper connections or any other connections other than PSU housing, using screwdriver to boot. CD, DVD, Floppy, Soundcard, USB expansion card, game card expansion, other USB connections - taken out/disonnected (ide, power etc) but problem still exists I have even tried, once an app is running, diconnecting mouse, keyboard and monitor (!!) with the problem still taking place. I have effectively changed PC entirely with these tests and still get this problem! One idea that was thrown out was a bios-residing virus. is there such a thing (i cannot find mention of one anywhere let alone scanning or removal methods)? Does anyone have any other ideas? Any help very much appreciated Nick ps Please post reply (e-mail address is false) At this point what is the only thing left in common??? - Do the machines work fine with no HDD attached? - Have you tried a different power cord? - Have you tried a different outlet? Sounds like a combination of bad grounding and static buildup. |
#45
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Nick, please post EACH of your power supplies' amperage capacity with
its corresponding voltage rail--include stand-by(SB) amps too, please. sdlomi2 |
#46
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"Nick G" ignore @ nospam.com wrote in
: So the above list, is meaning that you removed ALL cards, devices, etc, that with only the HDD, video, and a single DIMM the system still powers off? yes, but only in windows or during the install. it has yet to power off whilst in the bios What about while setting at a POST error from not having anything but the video card? Either way, my solutions would likely revolve around either triple-checking all the BIOS settings, or calling a priest. |
#47
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try checking your master/slave setting on HD and cd-rom! if you can put it
on cable select. had same problem once "Joe Bramblett, KD5NRH" wrote in message ... "Nick G" ignore @ nospam.com wrote in : So the above list, is meaning that you removed ALL cards, devices, etc, that with only the HDD, video, and a single DIMM the system still powers off? yes, but only in windows or during the install. it has yet to power off whilst in the bios What about while setting at a POST error from not having anything but the video card? Either way, my solutions would likely revolve around either triple-checking all the BIOS settings, or calling a priest. |
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