ASUS P5Q SE/R powers off by itself

[NEM1S1S]

OK, replaced a dead 600W PSU with a brand new 500W PSU. The PC has a graphics card with 2 x DVI ports, but I don't currently have a monitor with a DVI port! So, install new PSU, powers on, great, I can hear beep code. After about 30+ seconds, PC powers itself off. Is this a BIOS setting? Flying blind here.

[Steve R Jones]

Could be a heat issue. Is the CPU fan running OK?

[NEM1S1S]

CPU fan running fine. I might take it off and give it a good clean.

edit: been running for over 10 minutes now. Didn't really do much to it.

[Midknyte]

The PC has a graphics card with 2 x DVI ports, but I don't currently have a monitor with a DVI port!

Most video cards come with DVI to VGA adapters. Is this your computer or are you fixing it for someone else?

[NEM1S1S]

Someone's elses. I hit Function keys F1-F10 then enter after each and it "booted" (HDD LED going spastic), then I powered down, seems ok.

[Midknyte]

I figured since you didn't have the proper monitor/adapters. See if the owner has the adapters. They should have come with the video card.

[fink]

It's obviously impossible to tell what's going on without a monitor but if you have speakers to hook up you should get the Windows startup sound when the boot routine is close to finished.. just a small clue as to what's happening (or not) until you get a monitor hooked up. Having said that, powering off the computer without doing a full and complete shutdown via the actual Windows shutdown routine isn't a particularly good thing to do esp repeatedly.