Home-built Computers New system won't post

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Subject Author Date
New system won't post Matty Anderson 06-21-07
Posted by Matty Anderson on June 21, 2007, 6:37 pm
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Yesterday I assembled a new system:
Biostar NF4U AM2G mobo
Sapphire X1950XT Pro PCI-E video card
AMD 400+ X2 cpu
Apevia 500W PSU
2 x 1Gb Wintec AmpX 6400 DDR2 ram
Seagate 400Gb SATA hd
Seagate 120 IDE hd
2 Lite-On DVD burners

That's it, nothing too fancy. When I first powered on, it posted, and I
went into BIOS to change boot order to boot from CD. Then I powered down,
and left it overnight. Today when I pressed the power button, no post.
WTF? All that happens is there is power for a split second, just enough for
the fans to spin and for the keyboard LED's to flicker for a moment. Then
nothing, except the power light remains on on the case. If I hold power
button down for 5 sec, power led shuts off, and when I press power again,
same thing.

I have just taken everything out of the case and reseated the CPU, RAM,
video card... no change. I have never experienced this before. Any ideas?
I'm racking my brain, but there are so few symptoms I can't even make a
reasonable diagnosis. Unfortunately I don't have a spare PSU to try. Could
it be the PSU? mobo? I can't think what else could be the culprit.

Thanks for your advice,
Matt



Posted by on June 21, 2007, 7:02 pm
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> Yesterday I assembled a new system:
> Biostar NF4U AM2G mobo
> Sapphire X1950XT Pro PCI-E video card
> AMD 400+ X2 cpu
> Apevia 500W PSU
> 2 x 1Gb Wintec AmpX 6400 DDR2 ram
> Seagate 400Gb SATA hd
> Seagate 120 IDE hd
> 2 Lite-On DVD burners
>
> That's it, nothing too fancy. When I first powered on, it posted, and I
> went into BIOS to change boot order to boot from CD. Then I powered down,
> and left it overnight. Today when I pressed the power button, no post.
> WTF? All that happens is there is power for a split second, just enough for
> the fans to spin and for the keyboard LED's to flicker for a moment. Then
> nothing, except the power light remains on on the case. If I hold power
> button down for 5 sec, power led shuts off, and when I press power again,
> same thing.
>
> I have just taken everything out of the case and reseated the CPU, RAM,
> video card... no change. I have never experienced this before. Any ideas?
> I'm racking my brain, but there are so few symptoms I can't even make a
> reasonable diagnosis. Unfortunately I don't have a spare PSU to try. Could
> it be the PSU? mobo? I can't think what else could be the culprit.
>
> Thanks for your advice,
> Matt

All I can suggest is to strip it to the bare minimum to narrow things
down. Remove all cards & drives, see if it stays up. After that its
playing swaps with the remaining bits. mobo and psu have to be the
prime suspects.


NT


Posted by Travis McGee on June 21, 2007, 7:43 pm
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Hmmmmmm. Seems as if I had that problem once. A long time ago. I think it
was a CPU fan that wasn't working. Try a minimum set=up, video card,
keyboard, memory. Unplug all drives. Leave case open and watch for the CPU
fan to start immediately after starting up.
HTH



Posted by Matty Anderson on June 21, 2007, 7:57 pm
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That minimum setup is exactly what I've got right now (with the CPU, too).
Yes, the CPU fan does spin. There are 6 fans: 2 in the PSU, CPU, case, and
northbridge, and they all spin for just a second, and then slow down to a
stop. The obvious symptom is that power is only staying on for a split
second, then quitting. I'm guessing it sounds like it starts with the PSU.


> Hmmmmmm. Seems as if I had that problem once. A long time ago. I think it
> was a CPU fan that wasn't working. Try a minimum set=up, video card,
> keyboard, memory. Unplug all drives. Leave case open and watch for the CPU
> fan to start immediately after starting up.
> HTH
>
>



Posted by Travis McGee on June 21, 2007, 8:04 pm
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> That minimum setup is exactly what I've got right now (with the CPU, too).
> Yes, the CPU fan does spin. There are 6 fans: 2 in the PSU, CPU, case,
and
> northbridge, and they all spin for just a second, and then slow down to a
> stop. The obvious symptom is that power is only staying on for a split
> second, then quitting. I'm guessing it sounds like it starts with the
PSU.
>

If you're SURE all your front headers all attached correctly, then yes, you
need to sub another PSU to test.



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