Computer turns on then off...

vryfny · 11-20-2008, 06:43 PM

This started this morning when I rolled out of bed and went to hit the power button on my computer, and to my horror I shocked it. The computer powered on for like 5 seconds and then shut right back off. I tried to turn it back on by pressing the button but it didnt work. I turned the psu switch off and then back on and the computer turned on immediately, without me even pressing the power button. I tried a few more times, and same thing so I hopped on my laptop and looked it up and found a few things to try. I tried unplugging everything from the psu except the mobo, and same thing happened. I tried unplugging the wire from the power button to the mobo and still when I flipped the psu switch the computer would turn on and then back off. I also went to the store and bought a new psu which did the exact same thing. I also took a flashlight and checked out the mobo for any obvious damage and found nothing.

Any ideas of things I could try or what the problem might be?

**kev1952** · 11-21-2008, 07:17 AM

The power button isn't stuck, is it? Take the side cover off and physically disconnect the power switch from the mobo front panel connectors and see if it still starts when you turn on the PSU. If it doesn't then the switch is the most likely culprit. Test by momentarily shorting the 2 pins that the power switch connects to with a screwdriver - it should startup normally.

**speedster123** · 11-21-2008, 07:24 AM

do you have a rug in your bedroom? ..static
what power supply is installed?

11-20-2008, 06:43 PM	#1 (permalink)
vryfny Registered User Join Date: Nov 2008 Posts: 1 OS: xp	Computer turns on then off... This started this morning when I rolled out of bed and went to hit the power button on my computer, and to my horror I shocked it. The computer powered on for like 5 seconds and then shut right back off. I tried to turn it back on by pressing the button but it didnt work. I turned the psu switch off and then back on and the computer turned on immediately, without me even pressing the power button. I tried a few more times, and same thing so I hopped on my laptop and looked it up and found a few things to try. I tried unplugging everything from the psu except the mobo, and same thing happened. I tried unplugging the wire from the power button to the mobo and still when I flipped the psu switch the computer would turn on and then back off. I also went to the store and bought a new psu which did the exact same thing. I also took a flashlight and checked out the mobo for any obvious damage and found nothing. Any ideas of things I could try or what the problem might be?

11-21-2008, 07:17 AM	#2 (permalink)
kev1952 TSF Enthusiast Join Date: Dec 2006 Location: Townsville, Australia Posts: 1,007 OS: Win Vista Home Premium	Re: Computer turns on then off... The power button isn't stuck, is it? Take the side cover off and physically disconnect the power switch from the mobo front panel connectors and see if it still starts when you turn on the PSU. If it doesn't then the switch is the most likely culprit. Test by momentarily shorting the 2 pins that the power switch connects to with a screwdriver - it should startup normally. __________________ Cheers.... Kev *"The Definition of an Upgrade: Take old bugs out, put new ones in."* Please don't send me PM's for support. Post in the forums for everyone to benefit.

11-21-2008, 07:24 AM	#3 (permalink)
speedster123 Mentor Join Date: Oct 2006 Location: United States-New York-Long Island Posts: 5,223 OS: xp pro SP3	Re: Computer turns on then off... do you have a rug in your bedroom? ..static what power supply is installed? __________________