New cpu, computer wont stay off

caz32 · 12 Feb 2009 at 10:33

Hey

I recently got a new CPU and since its been installed my computer wont turn off.

I shut it down like normal, Start > Turn off computer > Turn off (Windows XP, SP2) then after about 5 seconds of being off it turns back on again.

I have reinstalled Windows XP recently and before i reinstalled it would do it aswell. I have checked in the BIOS for thing's that could turn the PC back on and everything is turned off.

When i installed the CPU i made sure the PSU connection to the motherboard wasn't loose and rechecked again today and it slots and clips in fine.

What do you think it could be? or do i have to turn it off at the wall from now on?

deuse · 12 Feb 2009 at 10:42

What happens when you press the power button to shut down
does restsrt then?

uber_cookie · 12 Feb 2009 at 10:46

wake on lan is enabled and you have firewire card installed.
If it is not that then try reseting bios to factory defaults.

caz32 · 12 Feb 2009 at 10:50

If i hold the power button in from the front it will just turn back on again.

What is firewire card?

And like i said Wake on LAN can't be enabled because in the BIOS it says its disabled.

I have reset my BIOS to default 2 times and also installed latest drivers.

uber_cookie · 12 Feb 2009 at 11:41

Option in bios > Restart after power loss? What motherboard do you have?
Any extras that you have installed? such as sound card usb card or anything els?

deuse · 12 Feb 2009 at 12:23

If you press the power button just once it should shut
down your pc, dont keep your finger on it

caz32 · 12 Feb 2009 at 14:58

Powering it off using any form of method it will reboot (I don't have a PSU Switch on the back) so the only way to turn it off is at the wall.

I haven't installed anything new, just my new CPU.

This is my motherboard:

http://www.asrock.com/mb/overview.asp?Model=ConRoe1333-D667 R1.0

Someone suggested i should do a hard reset using the CMOS.

Slinkie · 12 Feb 2009 at 16:47

pull out all the connections to the case (power switch, reset, LEDs etc) remove the mouse and keyboard, unplug hdd so you only have main components plugged in (remove wifi and sound cards for now, you won't be booting into windows with your hdd plugged in). Start the pc by shorting the power on switch with a screw driver and let it boot until you get the message can't find system disk. Then short the power again to turn it off. If it then restarts you know its to motherboard that is playing up. If not, add back things one at a time and see what causes the issue

flying grouse · 12 Feb 2009 at 19:11

have you checked your BIOS settings since changing CPU, try and reset your motherboard with the jumper CLRTC, remove the battery first.

or it could be a HDD fault, had this once before my disk died