Randomly Rebooting

My computer reboots itself! Randomly! It smurfing sucks!

I installed a second hard drive. Now I have a half gig with my installs, and a one gig with my datas. But the random rebooting is not acceptable.

How do I make it stop?

Is your computer actually shutting down and rebooting, or does it just kinda turn off in an instant? Do you get a bluescreen before it reboots? Is it getting hot? It could be the result of overheating or you might have bad memory/PSU/GPU.

If it's overheating, you can download a program like HWMonitor, which'll tell you how hot your CPU is getting. If you run it immediately after a random reboot and it's up around 80+ degrees celcius then that's probably what it is. Also, if you're hearing any super-high-pitched whiney-whistle then it's probably your CPU overheating, but not all overheating CPUs make that noise.

If it's bad memory or GPU, then you'll probably be seeing a bluescreen before the reboot (but not necessarily) should download memtest86. You can either get the ISO version and burn it to disc; then boot your computer with the disc in the drive or you can get the installable version and run it from Windows.

Otherwise you could be looking at a faulty power supply unit, in which case you should replace it as SOON as possible, cos failing PSUs are particulary good at ruining other parts of your system.

I would guess it's the power supply, since it now has to power two hard drives. I will check out the heat issue though.

It just clicks off and back on again, as if I had hit the reset button.

Ooh, right, so the rebooting only happened after the second drive? Then it's probably none of the things I mentioned, but an underpowered PSU. I still recommend replacing it as soon as you can, because an underpowered PSU is just as dangerous to the rest of your machine as a faulty one. :p

don't go cheap on power supplies. I know that Corsair is a little pricey but from all the reviews, quiet, reliable, and delivers the power.

I've recommended them and used them myself and have had no issues.

Antec is a a good brand as well. So good that they have their own calculator so you know what PSU to buy!

check it out! Antec Power Supply Calculator

Do you know how much power your PSU can deliver?

Also, do you mean terabytes rather than gigabytes, perhaps?