Solved: No OS will load

I have a Dell Dimension 4700 (yeah old I know, not getting a new one), and I use Windows XP Pro on it, with Ubuntu also on the hard drive. The hard drive is not stock I know for sure. Last night,I couldn't get to sleep, and my computer runs 24/7, so I hear it all te time.All of a sudden, I heard it shut down. I turned it back on, and the instant it attampted to load Win XP, it shut down with no error message. I then tried Ubuntu by opening the OS menu in the BIOS (Dell A10), and that shut down the computer immediately too. I knew I had a USB drive with Linux on it somewhere (I've used it before and it works), so I plugged it in, and selected "Boot from USB device". Then it said "USB device not detected, F1 to try again, F2 to run setup utility.". At this point I suspected a capacitor blew, or something was on fire, so I did a quick physical check of the motherboard, and nothing seemed amiss. I will probably get back soon with the hard drive information.

EDIT: I tried again 10min later and Win XP would load. Still waiting for issues

 

360noscope,

In the future please do not edit your original post as this will not activate the email notification to those who are helping you. Always post a Quick Reply so as to let all know a response has taken place.

 

My computer has been running since I posted the edit, and not a single hitch yet, So I'll put it as solved, because my computer runs, and I have a rudimentary understanding of the problem. I'm still curious to what exactly could cause the problem I had.