I've been told to short pin 4 on my pc psu to the case to diagnose a fault. What he didn't tell me is what the result would be. Can you tell me what i'm looking for please? Should it spin the fan on the psu, thus indicating that there's power to it, or should it be to test something else?
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LOL... If you haven't already fried your motherboard by using your modified PSU (And that's a big IF), then you need to buy a new PSU with similar specs and connection plugs (ie. a 24pin main) as the original PSU that came with the PC.
Sound to me like all you need is a new power supply. You should be able to find one online.
The power supply should have taken all the jolt and not the motherboard.
If you need help finding a power supply let me know, usually they are pretty generic, but you may have to get one from HP.
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Be sure that the ATX or BTX power cable (the rectangular cable with 20 or 24 pins) is securely fit into the motherboard. Re-seat it if needed. Also, check the +12V 4-pin adapter (if exists) is seated, just like the 20/24 pin is. If that doesn't solve the problem, be sure that the PSU is switched on and is at 120V (USA) before plugging in the power cable. If that doesn't work, contact the computer manufacturer or the PSU manufacturer (depdending on what you purchased.)
there are fuses inside psu`s some are solderd and some pop out it i would suggest that u throw the psu away and buy new chances are that it will only cause continues and may even result in complete mobo failure problems heres a link to a cheap psu http://www.microdirect.co.uk/(3649)400W-P4AMD-quiet-PSU-with-PFC-20-pin-24-pin.aspx or a more upmarket more powerfull http://www.microdirect.co.uk/(11879)ThermalTake-TR2-500W-Black-Silent-ATX-12V.aspx the choice is yours.