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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Is the fan running in the power supply ? Unplug all the drive power leads and try it. If it still shuts down, try another PSU, by just plugging it onto the mother board only. If it still shuts down, I suggest it is a motherboard fault. The motherboard turns on the PSU, when you press the on button, it shorts 2 pins on the motherboard to start the power.
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.)
Remove the PSU from the case.
Plug it to power.
Turn it on
Using a paper clip, short circuit the green wire pin with the the black wire pin on the 24 pins connector.
If the PSU fan start, remove the clip. The fan should keep spinning. That means that the PSU is working.
If the PSU is working, then the power up pins on the mother board might not be shortcircuited by the front panel switch.
Connect the PSU to the motherboard and to the power, turn it on. On the motherboard, locate the power up pins and short circuit them with the paper clip. If the computer powers up then there is a problem with the power on switch.
If the PSU does not start at all, return it.
If you can't return it, unplug from power, open it (warrenty voids!) and look for a fuse that looks like a one inch glass tube with metal caps. inside should be a wire. If the wire is broken, buy a new fuse in Radio Shack.
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.