PC booting and rebooting repeatedly without completing POST

Question

I have a custom build PC:

Corsair HX620 PSU Intel 6870 C2D Geforce 8800GT Asus P5Q-E

I've recently moved from the UK to Canada, upon plugging my UK built PC into the wall socket it gets stuck in an infinite loop of booting and rebooting, the fans spin, internal and external LED's light, but no output to the monitor.

My HX620 apparently will auto select the right voltage, but I can't rule regional issues out, I am using brand new Canadian plugs, straight into the wall socket.

EDIT @ 9:44PM 04/08/2011

Tried the following:

Reseat graphics card - No effect

Remove and replace battery from motherboard - No effect

Disconnect HDD - No effect

Disconnect Graphics Card - No effect

Disconnect CD-ROM - No effect

Reseat RAM modules - No effect

Remove 3 RAM modules - No effect

Swap remaining RAM module with one of the 3 removed - No effect.

Answer 1

If things look OK physically (ie: heatsinks, etc.) then if you remove your RAM, and you get no POST beeps telling you you have no RAM, your motherboard or PSU is probably broken/malfunctioning.

Amongst what others have suggested, you can try:

• Try a different wall socket, and if you have one, a different mains cable.

• Determine if on-board power-good LED is staying lit steady during these power cycles, if it's turning on and off with the power cycles, then it's probably the power supply.

• Reseat (unplug and replug) all your power taps. I see that PSU has modular plugs, so do it to both ends. Triple check that the 24-pin ATX cable is 'clicked in' all the way.

• Unplug all drives, take out everything except the CPU, RAM and Video. If it works, then start plugging stuff back in one at a time until you find the culprit.

• If it still doesn't work, then the next thing to try is a known-good power supply. You may want to try this before the previous suggestion if you have one kicking around. :)

• If that doesn't fix it, it's more than likely a busted motherboard.

Answer 2

Only things I can think of is that the auto select for voltage didn't work and it has fried itself (the PSU) or the PC got knocked about a bit in transit.

Try opening the case and re-seating everything first. If that doesn't do the trick I'd try buying a new PSU.

Answer 3

There would be 3 problem until I know:

1 - Processor: Check if your processor is well fit on socket and the cooler is also collecting processor's heating.

2 - Memmory: Check if your memmory sticks are well fit on them sockets.

3 - Video Card: Check if your VGA is well fit on your PCI-Express socket.

If after checking all of this itens and nothing happends so maybe would be another hardware problem that you can only verify by changing items (processor, memmories, VGA or even the motherboard).