PSU Problem

JunkBot

JunkBot

JunkBot

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Joined
21 May 2006
Posts
327
Hello

PC died a few years ago and never tried to solve the problem, have go the PC back out again and stripped it down and cleaned all the components and put it back together again.

When I flick the PSU power button the motherboard LED illuminates however when I press the power button the CPU fan moved slightly but doesn't spin up and nothing else happens.

Could this be a dead PSU, I don't have another to try it with but was thinking of buying a cheap 1 online to test - however the system is about 10 years old so don't want to be spending a fortune on it. If I can get it working great it's something to have a potter about with.

Any ideas?

Thanks
J
 
Does the PSU start when you link pins 13 & 14 on the main ATX connector with just a small load connected to one of the molex leads - ie a fan.

(The pins are counted with the extra 4 pins removed)
 
Not sure what you want me to try....

If I disconnect the the 24 pin ATX connector and attach pin 13 & 14 to a 3 pin fan connector and then try to boot? Do I need to disconnect any of the other PSU leads from the mobo
 
Nooo :p

Link pins 13 & 14 with a paper clip or a piece of wire and for a little load connect a fan to one of the molex connectors, have no other leads connected to the motherboard or devices.

 
OK, I have done the paper clip test which has confirmed that the PSU is working. However when all connected up the fan moved slightly then nothing.

Any other ideas or test I can do - not quite sure where to start with diagnosing problems so any help would be appreciated.
 
UPDATE: I have taken the advice above and it appears to be a GFX issue as the fans spin in with the card removed albeit giving a long beep - I assume this is because there is no GFX card installed (there is no onboard graphics). Will have a search for a cheap replacement card.

Thanks for all of your help its most appreciated.
 
The faulty card was a BFG GeForce 7800, would preferably like to replace it with something of a similar spec. It was only 256mb can I take it the 5450 would be a decent replacement.

I'm not wanting to throw fortunes at it but would like to get it back up and running if you get my drift.
 
I used to have a 7900GS, which died quite spectacularly with smoke and sparks! replaced it with a BFG 9800GT Green Edition which died quietly about this time last year.

If you're wanting to play a few games, then I really wouldn't go with the 5450 or GT610, as they're really basic cards designed for multimedia/office PCs. I suggested those because they're pretty much a go-to troubleshooting card - they're low powered and don't need a PCI-E power connector.

If you can afford it, a GTX750Ti would give you pretty good performance at 1080p. If you're running 1280x1024 (like I did until Xmas), then it should handle most things but don't expect it to run the latest titles on high settings.

I've just chucked one of these into an HTPC build and I love it (and yes I do have a 980Ti in my main PC!). You do pay a premium for Nvidia, but it was worth the investment. On the AMD side, I'm not quite sure what the equivalent is but it may be slightly cheaper.
 
JunkBot said:
UPDATE: I have taken the advice above and it appears to be a GFX issue as the fans spin in with the card removed albeit giving a long beep - I assume this is because there is no GFX card installed (there is no onboard graphics). Will have a search for a cheap replacement card.

Thanks for all of your help its most appreciated.
Click to expand...

It could still be the Psu, as it may not be providing enough juice to power up the Gpu. Is it possible to try the Gpu or/and the Psu in another system.
What is the make and model of the Psu?
 
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