Motherboard will not POST
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Posted by Tom Mislewski on May 29, 2005, 12:36 am
Please log in for more thread options I'm building a HTPC with a Pentium 4 3.2ghz Northwood CPU, two 512meg sticks of Mushkin PC3200 ram, Zalman CNPS 7000-A AlCu heatsink, Arctic Silver Ceramique thermal compound, and a Intel 865 PERL motherboard. The power supply I'm using is a 400w Seasonic Super Silencer. When I 1st powered the computer the heatsink fan started up and I got a very rapid series of beeps. I thought the problem might be caused by CPU as the Intel 865 PERL instruction manual stated that seven beeps indicates a CPU problem though there seemed to be more than seven beeps sounded in the attempt to boot. So I removed the motherboard and power supply from the case, removed the heatsink and CPU, cleaned off the old thermal compound with 91% isopropyl alcohol and reapplied a new coat os thermal compound. I also removed and reinstalled the two sticks of Mushkin RAM. I left the motherboard out of the case, jumpered the off/on pins on the motherboard and reconnected the power cables. Now when I try to boot the system I no longer get any beeps. Instead after about 5-7 seconds the fan on the heatsink stops spinning. I've tried attaching a video card but the machine never gets far enough along to output video. Any idea as to what's wrong. I hope I havent fried by motherboard or CPU. Thanks. | ||||||||||||||||
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Posted by kony on May 29, 2005, 6:01 am
Please log in for more thread options On 28 May 2005 21:36:28 +0500, "Tom Mislewski" You do realize that a 3.2 GHz CPU is a bit excessive? It'd be good to undervolt and underclock it. >The
>power supply I'm using is a 400w Seasonic Super Silencer. When I 1st >powered the computer the heatsink fan started up and I got a very rapid >series of beeps. I thought the problem might be caused by CPU as the >Intel 865 PERL instruction manual stated that seven beeps indicates a >CPU problem though there seemed to be more than seven beeps sounded in >the attempt to boot. First thing I'd have done is checked for any motherboard jumpers, cleared the CMOS, and removed one memory module. Then again, i have no idea of any or all of these parts are (yet) proven working, new/old/etc/etc, would be making certain assumptions. >So I removed the motherboard and power supply from the case, removed the
>heatsink and CPU, cleaned off the old thermal compound with 91% >isopropyl alcohol and reapplied a new coat os thermal compound. It's not sitting on an antistatic mat or packing material, is it? I ask because it shouldn't be. >I also
>removed and reinstalled the two sticks of Mushkin RAM. I left the >motherboard out of the case, jumpered the off/on pins on the motherboard >and reconnected the power cables. Don't jumper the off/on pins, because, well you'll mention it in a moment... >
>Now when I try to boot the system I no longer get any beeps. Instead >after about 5-7 seconds the fan on the heatsink stops spinning. How do you "try to boot"? It ought to turn on immedately after plugging the AC cord into the power supply, if as mentioned above you had jumpered the PS-On pins, but then because they're jumpered, it'd turn back off again in a few seconds- because the pins need be a momentary contact, just touch something (or the jumper) to short them for an instant then remove that shorting part. >I've
>tried attaching a video card but the machine never gets far enough along >to output video. ??? Attaching a video card or a monitor? It needs a video card, always.. Set it up in a bare minimal configuration with ONLY: Video card, 1 memory module, CPU, CPU heatsink/fan, fan plugged into CPU fan header on the motherboard. If your fan doesn't have RPM signal (3rd lead output), substitute a fan that does if it doesn't work "yet" otherwise. Naturally you'd connect the monitor to the video card. You do not need keyboard, mouse, drives, nor any case connectors yet. Momentarily short the two Power-on pins together with anything conductive, for a brief moment. At that point the system should turn on and run... until you short the two power on pins together for about 4 or 5 continuous seconds, or touch it again momentarily (depending on which option is set as the default in the motherboard bios. If it works at that point, proceed to hook up keyboard and check bios settings (if applicable). If that works and it completes at least a couple off/on cycles, try recasing it. > Any idea as to what's wrong. I hope I havent fried by
>motherboard or CPU. Thanks. You haven't mentioned anything to indicate that may've happened "yet". | ||||||||||||||||
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Posted by Tom Mislewski on June 1, 2005, 7:26 am
Please log in for more thread options
>On Sun, 29 May 2005 03:01:52 GMT, kony wrote:
>>On 28 May 2005 21:36:28 +0500, "Tom Mislewski"
>>I'm building a HTPC with a Pentium 4 3.2ghz Northwood CPU, two 512meg
......
>>sticks of Mushkin PC3200 ram, Zalman CNPS 7000-A AlCu heatsink, Arctic >>Silver Ceramique thermal compound, and a Intel 865 PERL motherboard. >>So I removed the motherboard and power supply from the case, removed the
>>heatsink and CPU, cleaned off the old thermal compound with 91% >>isopropyl alcohol and reapplied a new coat os thermal compound. >It's not sitting on an antistatic mat or packing material,
>is it? I ask because it shouldn't be. Yes it was sitting on the antistatic packing material. Big mistake on my part. >I also
>removed and reinstalled the two sticks of Mushkin RAM. I left the >motherboard out of the case, jumpered the off/on pins on the motherboard >and reconnected the power cables. >Don't jumper the off/on pins, because, well you'll mention
>it in a moment... Another big mistake on my part. >Now when I try to boot the system I no longer get any beeps. Instead
>after about 5-7 seconds the fan on the heatsink stops spinning. >How do you "try to boot"?
>It ought to turn on immedately after plugging the AC cord >into the power supply, if as mentioned above you had >jumpered the PS-On pins, but then because they're jumpered, >it'd turn back off again in a few seconds- because the pins >need be a momentary contact, just touch something (or the >jumper) to short them for an instant then remove that >shorting part. I removed the jumper from the on/off pins and the motherboard booted. Thanks for all your help, Kony. | ||||||||||||||||
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>sticks of Mushkin PC3200 ram, Zalman CNPS 7000-A AlCu heatsink, Arctic
>Silver Ceramique thermal compound, and a Intel 865 PERL motherboard.