pc dies after 3 seconds

helm · 07-16-2008, 07:59 PM

Hey all, I have a self built computer(wasn't sure exactly what forum to go for so I ended up here

) It's a year old but I recently replaced the psu(everything was working fine) then I replaced the mobo and now when I try to power up the pc it dies after *about* 3 seconds(just after the cpu fan starts spinning). tried clearing the cmos and all that. I have a new 620W psu which worked fine with the other components so it can't be that(i think). Just a little stumped as to what it is, tried starting without graphics card, and with only one ram chip but to no avail. So basically I'm confused. When it's plugged in the mobo does light up so it's definately getting power, and for the three seconds it is on all the components(other fans, graphics card fan...) seem to start working too. any ideas?

Thanks

~~Systems_Analyst~~ · 07-16-2008, 09:47 PM

Remove all of the computer parts again and only reseat the power supply, motherboard, cpu, one stick of ram, and videocard. Then turn on the computer and see if the problem goes away. Could be a grounding issue.

Tumbleweed36 · 07-17-2008, 05:40 AM

I suspect when you replaced the motherboard, that one of the motherboard standoffs might be in the wrong place for this board. Just make sure that there is a hole for every screw and a screw for every hole, no more, no less. (usually 9 for standard boards). If not correct, the board is shorting out.

**vladimirb** · 07-17-2008, 06:14 AM

Hey mate and welcome to TSF...
You older Motherboard was faulty or you just wanted to get better one???
If your previous Motherboard is fine, try to start PC with previous one again to see if all other components are OK...
If you succeed in that, then Tumbleweed is right [maybe you hooked new Motherboard wrong or it might be faulty]...
Hope this will help you mate...

helm · 07-17-2008, 07:04 AM

Hey and thanks for the welcome =). I was just thinking about that screw/hole issue and I think you may be onto something, I never considered it, thanks I'll give it a go now and get back to you all

Tumbleweed36 · 07-17-2008, 07:28 AM

Do let us know. A hole for every post, a screw for every post....no more, no less. Sure sounds like that might be an issue. A misplaced one can cause exactly what you are seeing.

07-16-2008, 07:59 PM	#1 (permalink)
helm Registered User Join Date: Jul 2008 Posts: 10 OS: xp sp3	pc dies after 3 seconds Hey all, I have a self built computer(wasn't sure exactly what forum to go for so I ended up here) It's a year old but I recently replaced the psu(everything was working fine) then I replaced the mobo and now when I try to power up the pc it dies after about 3 seconds(just after the cpu fan starts spinning). tried clearing the cmos and all that. I have a new 620W psu which worked fine with the other components so it can't be that(i think). Just a little stumped as to what it is, tried starting without graphics card, and with only one ram chip but to no avail. So basically I'm confused. When it's plugged in the mobo does light up so it's definately getting power, and for the three seconds it is on all the components(other fans, graphics card fan...) seem to start working too. any ideas? Thanks

07-16-2008, 09:47 PM	#2 (permalink)
~~Systems_Analyst~~ Troubled Join Date: Jul 2008 Posts: 40 OS: Windows XP Professional	Re: pc dies after 3 seconds Remove all of the computer parts again and only reseat the power supply, motherboard, cpu, one stick of ram, and videocard. Then turn on the computer and see if the problem goes away. Could be a grounding issue.

07-17-2008, 05:40 AM	#3 (permalink)
Tumbleweed36 Asst Manager Hardware Join Date: May 2005 Location: USA Posts: 19,657 OS: XP Professional	Re: pc dies after 3 seconds I suspect when you replaced the motherboard, that one of the motherboard standoffs might be in the wrong place for this board. Just make sure that there is a hole for every screw and a screw for every hole, no more, no less. (usually 9 for standard boards). If not correct, the board is shorting out. __________________ ---------- I don't receive email notifications of replies to subscribed threads. (Internet provider policy) Therefore, if I don't respond to your post within 24 hours, please send me a reminder PM and include the link to your thread.

07-17-2008, 06:14 AM	#4 (permalink)
vladimirb Mentor Hardware Team Join Date: Mar 2008 Location: Banja Luka, Serb Republic Posts: 3,681 OS: xp pro sp3, Server 2003, Windows 7 Professional x64bit My System	Re: pc dies after 3 seconds Hey mate and welcome to TSF... You older Motherboard was faulty or you just wanted to get better one??? If your previous Motherboard is fine, try to start PC with previous one again to see if all other components are OK... If you succeed in that, then Tumbleweed is right [maybe you hooked new Motherboard wrong or it might be faulty]... Hope this will help you mate... __________________ MCP - MCSA Cisco SMB Account Manager

07-17-2008, 07:04 AM	#5 (permalink)
helm Registered User Join Date: Jul 2008 Posts: 10 OS: xp sp3	Re: pc dies after 3 seconds Hey and thanks for the welcome =). I was just thinking about that screw/hole issue and I think you may be onto something, I never considered it, thanks I'll give it a go now and get back to you all

07-17-2008, 07:28 AM	#6 (permalink)
Tumbleweed36 Asst Manager Hardware Join Date: May 2005 Location: USA Posts: 19,657 OS: XP Professional	Re: pc dies after 3 seconds Do let us know. A hole for every post, a screw for every post....no more, no less. Sure sounds like that might be an issue. A misplaced one can cause exactly what you are seeing. __________________ ---------- I don't receive email notifications of replies to subscribed threads. (Internet provider policy) Therefore, if I don't respond to your post within 24 hours, please send me a reminder PM and include the link to your thread.