Pre Built PC Failing To Boot

[coles101]

At the end of August last year, I bought a Novatech Isys 630 system with an Intel Pentium 4 630 3.Ghz cpu, 512mb DDR ram and an 80gb SATA HDD. Also had Windows XP Home pre-installed. I've not added any components etc since buying the PC and its only used for basic office applications and storing photos.

Last night I tried booting the PC up but it turned itself off during the BIOS startup sequence (at the point where it says press Del to enter setup etc) I tried again and it always turns off at the same point, no error messages, blue screens or anything, just switches off.

Anybody got any ideas? My first instinct is a power supply proplem but its a brand new pre-built PC, surely the supplies used are suitable for the components installed?

[Cowson2006]

I'm pretty sure its your processor over heating.

What you say happened to me when i took my cpu fan out to clean. After putting it back, my comp wouldn't boot, exactly how you described.
I then checked everything and relized that there was hardly any thermal paste on the Processor. I put some on and now its workin fine, infact, better.

[anthonygriff]

Try removing the battery from the motherboard and see if it'll start up without it. If it does then it's either a duff battery or the bios somehow became corrupted and the battery was keeping the corruption in memory.

Edit: Oops. Forgot to mention, check your bios settings and make a note of them as removing the battery will reset them to default settings.