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Simple question needs simpler answer (PSU related)

J

josboh

n00b
Joined
Dec 5, 2005
Messages
27
Computer wont post.
RMA'd the motherboard and just got the new one today. I sincerely dont think the CPU is toast.
Therefore, can a PSU be bad, yet still turn on the fans (3), video card, and hdd but not post.
Is this possible?
Thanks
 
Or.... user error... or CPU is toast. ;)
 
He means, you might be overlooking something, or the cpu is bad. The psu isnt bad if its spinning the fans up.
 
wee96 said:
...The psu isnt bad if its spinning the fans up.
Click to expand...

Well.... I wouldn't say that's necessarily true either.

All we know is the PC won't post.

Pull the board from the case so we know we're not shorting it on anything like an extra stand off, strip the board of everything but the CPU (no memory or video card either,) fire it up and see if you get a POST beep code.
 
first, i appreciate the help so far.
second, i removed everything from the board (cpu and mem, and video too) and still no post. So i guess I am to assume its the PSU? This truly sucks. But it would be 100 times better than a fried CPU. Any other tricks, or is this where Im at?
 
I said "everything but the CPU."

A motherboard doesn't typically give any post beep without a CPU.
 
I had similar trouble with one of my systems past days.

Every fan doing the job, but no post. PSU was faulty and fried the onboard power regulator, which fried CPU :(

When I tried another one (CPU), nothing happend, but MB is totally dead. Second CPU survived because of already fault MB. One of three memory modules also got killed :)

This is very rare case, but it is possible, as you can see.

Regards
 
jonnyGURU said:
I said "everything but the CPU."
Click to expand...

ok, so im slow. will do that when i get home. thanks.
im thinking tho, if i were to do that, how would it help me eliminate PSU from CPU?
also, after doing a little bit of research about this is it possible for the PSU to power everything but not work because the power on the 4 plug atx is bad? again, thanks.
 
It doesn't.

But if the board beeps, then the problem might be something other than the PSU or CPU. Could be RAM, shorted on the case, a backwards IDE cable, a bad video card....

If it doesn't beep, you at least know for sure the problem is the PSU, CPU or motherboard.
 
Try reseating the video card, securely. It's minor, but it also happesn to the best, and worst, of us.

It probubly isn't the psu. Really.
 
jonnyGURU said:
Well.... I wouldn't say that's necessarily true either.

All we know is the PC won't post.

Pull the board from the case so we know we're not shorting it on anything like an extra stand off, strip the board of everything but the CPU (no memory or video card either,) fire it up and see if you get a POST beep code.
Click to expand...

Its not impossible, but rare enough for me to be confident its not the psu is what I should have said :)
 
Ok. So here is where I am.
under jguru's instructions, i removed everything BUT the cpu and I actually got beep codes. 1 long 2 short. When I referenced the code back to the manual it showed that it was somekind of video or memory code. i then decided to try 1 stick at a time and as it turns out, one of the sticks of memory went bad. because once i put in only the one good stick it started to post. however, once i reconnected everything, it wouldn't post again. So I disconnected all DVD, Floppy and CDROM drives leaving on the HDD and the video card connected. This time it posted. Im thinking not that there is a slight chance that the PSU is becoming faulty and it wont power everything I have and start the computer. Im going to try and start connecting everything else one by one and see what happens. Thanks to you guys for your suggestions.
 
It could of been a bad DIMM slot. If you have more then 2 DIMM slots try the sticks in other slots and see what happens.
 
Yep, bad RAM then. You may want to upgrade to a 2x 1GB set at this time, removing both of your 512MB sticks, so you can run in duel channel, and 2GB is a good point to be at right now (plus cheap, try the Patriot 2GB set).
 
josboh said:
Ok. So here is where I am.
under jguru's instructions, i removed everything BUT the cpu and I actually got beep codes. 1 long 2 short. When I referenced the code back to the manual it showed that it was somekind of video or memory code.
Click to expand...

That's video.

Memory is a constant like a truck backing up.
 
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