Post your Computer Questions/Help

[Crono]

Once again my ****ty PC has problems. Now it's resetting itself immediately after boot-up. I did a quick google search and couldn't find anything. Can anyone help me before I feel like smashing my pc? I'm on a different one right now. I haven't reformatted yet and got a power source change a couple months ago. I have no damn idea what's wrong. It's definitely not overheating, although I will vacuum behind my desk to clean up any dust and cat hair.

Also, I want to reformat but I can't change my primary boot drive to CDROM, it wont let me, any suggestions? Thanks to anyone who has advice.