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PC half dead - not good Answered

Machine will not POST - no beep, BIOS smart fan-control not engaging, PS2 keyboard has no power, monitor reads "no signal"
Board does have power - things spin (like the CPU fan which shouldn't until it gets hot)

Preceding clues(?) -
I thought I'd developed tinnitus, but found it was the PSU (I think) making a high-pitched ringing noise, half the day unplugged and that seemed to go away.
Display not engaging properly on start-up: If I waited until the machine got to Windows login and then switch the monitor on - no problem. Switching the monitor on before this point - black sort of standby mode.

I think I might try the PSU first, then think about the mainboard. So far I've plugeed and re-plugged things, tried with 0,1 & 2 strips of RAM with no difference.

Any suggestions welcome

I spent a lot of time replacing 1 cap' in the PSU, then I replaced the PSU (logic being that if I've tampered with it an the thing still doesn't work I should replace it regardless)
Then I bought a new board. I was a bloody-sod, CD/DVD still doesn't work...

L

Tags:PCdead

12 Replies

user
NachoMahma (author)2010-02-23

.  I'd try a known good PSU first. If you need a new mobo, you might as well get a new computer.

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lemonie (author)NachoMahma2010-02-25

Yea, but a new board would be cheaper and I wouldn't have the bits that work to dispose of...

I'll see

L

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Punkguyta (author)lemonie2010-05-12

 I have a BOX of old PSU's, come get one, they're cheap even for a new 500 watt...

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user
lemonie (author)Punkguyta2010-05-12

I have a spare now so I'm OK, thanks.

L

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djr6789 (author)2010-02-25

i was given a computer for free with similar problems to this and it ended up being a faulty capacitor on the motherboard. i replaced and it was as good as new.

hope this helps

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user
lemonie (author)djr67892010-03-06

It didn't help my situation, but I appreciate the comment.

L

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user
djr6789 (author)lemonie2010-03-09

hmmmmm. maybe something has shorted and burnt one of the rails on the motherboard.

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user
V-Man737 (author)2010-02-23

Faulty capacitor probably making the noise. You could try to track it down and replace it, or... New motherboard.

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user
lemonie (author)V-Man7372010-02-25

That's what I was thinking (both comments)

L

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NachoMahma (author)V-Man7372010-02-23

.  Your mention of bad caps reminds me of the spate of bad mobo caps. Looking at the common name - pregnant caps - you can guess that they are usually easy to spot.
.  If you are unsure of your soldering skills on a multilayer PCB, you should be able to find a local hobbyist that will do the job for a cheap meal and a beer.

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