Bart
Member
Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
User status: Offline
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Its a friends PC not mine.
It will not boot at all.
When plugging the 3pin lead into the PSU you hear the crackle so I know the lead is fine. The mobo LEDs come on too.
When pushing the power button all the fans run a 3rd of their speed for litterly a millisecond then stop.
I've tried shorting out the power button pins on the mobo but still the same.
The power supply is the only thing I can think of.
Its not a gaming PC, so I may just purchase a cheap £15 550w PSU from novatech.
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MJFF88
Member
Registered: 30th Apr 08
User status: Offline
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Yep, definitely the PSU 
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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Bit more expensive, but I've just bought a Corsair PSU from eBuyer for about £55 which comes with a 5 year warranty. I'm on my 3rd PSU and non have lasted 5 years, so this is a worth while investment I think 
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Bart
Member
Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
User status: Offline
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I also personally have a corsair modular PSU which I really rate, but on a cheap PC for a child which is only being used to surf the net, I think the el cheapo will be sufficient 
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John
Member
Registered: 30th Jun 03
User status: Offline
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No it's not definitely the psu.
Psu is a good contender but from the information provided it could still be any part of the pc.
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Bart
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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
User status: Offline
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how do you mean john? If it was RAM/CPU I would still expect it to boot and scream beeps at me?
PSU or mobo would be my thoughts.
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Sam
Moderator
Premium Member
Registered: 24th Dec 99
Location: West Midlands
User status: Offline
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Short of putting the motherboard and other stuff in another known working case to test, how can you prove that the PSU is definately dead?
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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Surely it indicates PSU 'cause no power is getting though i.e. if no power was going to CPU, then there would be BIOS beeps. Same with graphics etc.
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John
Member
Registered: 30th Jun 03
User status: Offline
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Anything thats plugged in can cause they issues.
I have a fan thats causing exactly the issue you describe as a matter of fact.
The only way to be sure of anything is to test the parts, although guesses can be made.
A fan was not the top of my list for causing the problem.
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John
Member
Registered: 30th Jun 03
User status: Offline
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quote:
Originally posted by deano87
Surely it indicates PSU 'cause no power is getting though i.e. if no power was going to CPU, then there would be BIOS beeps. Same with graphics etc.
No
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Deadude
Member
Registered: 30th Jun 07
Location: Spondon, Derby
User status: Offline
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sounds to me like its shorting as it powers up and the psu cuts power to stops things exploding  ?
best way to check is take out every component and try powering up just mobo and see if power supply stay on and so on
[Edited on 21-10-2008 by Deadude]
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Kyle T
Premium Member
Registered: 11th Sep 04
Location: Selby, North Yorkshire
User status: Offline
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John is right, it could be ANY component in the PC causing it to shut off immediately.
Make sure the MoBo isn't shorting out on the case for a start, make sure all the brass spacers are in place and there isn't a blanking plate that has slipped down anywhere causing contact.
Then unplug everything except for a single stick of memory, the PSU and your processor. If it doesn't start, try another proven stick of memory.
It MAY be the PSU, but it isn't a dead cert.
Lotus Elise 111R
Impreza WRX STi
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pow
Premium Member
Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
User status: Offline
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But FFS do NOT leave the CUP without a fan
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