Power supply problem...help! 6

[DJCyber2101]

OK I am just replaced a case and power supply for a client because system stopped powering up at all.

Installed MB into new case made sure there were no shorts on the case. connect HDD, floppy etc. via IDE Cables.
Connected power and reset switch, HDD LED etc. Plugged in power plug to MB(ATX). Plugged in Monitor, Keyboard(PS2), Mouse(PS2) and power cable. Hit power switch and system powers on for about 1-2 seconds then dies. Power in not even on long enough to turn on monitor. If I unplug and replug in the power cable and wait for 5 minutes I can power on for about 1-2 seconds (same as above). Any suggestions?

Ken

 

[paparazi]

evolutionary

These symptoms usually indicate one of the following:
1) You have connected the CPU fan to the system fan header by mistake (CPU fan header needs to sense a spinning fan or will shut down the PC)

2) The heatsink is fitted 180degrees out? and to all intense and purposes everything looks fine BUT!!! the heatsink doesn't quiet sit squarely on the CPU core so overheats very rapidly (a few seconds) reaches it's thermal cut off point and turns off (don't forget thermal paste!!!)

3) You may have one too many brass standoff mounting points fitted or one in the wrong position so shorting out the motherboard to ground.

4) A plugged in device (CDrom, PCI card, Hard drive) has gone bad and causing a partial short.
Pull out and disconnect all addon cards, CDroms, HDD's etc and see if it posts then.

5) Front side bus jumpers (if the motherboard has them) are set wrong but this wouldn't usually give this symptom.

Martin

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