A virus scan didn't turn up anything, and my brother thinks it is overheating, but doesn't really know.
U should 1st test, if its really overheating, search for a program which is called "CPUburn". This will turn up your CPU to 100% load, so be careful.
If you've a C++ compiler on your sys, u can simply compile the following:
#include <iostream>
int main(void)
{
volatile short i=0;
while(1)
{
std::cout << i++;
}
return 0;
}
if you are running this code, you'll have to kill it using Ctrl+C from the command-line, because it uses a never-ending loop.
Also, if I need to take it in for service, what would be a good way to hide or encrypt sensitive information?
Try TrueCrypt:
http://www.truecrypt.org/ . Simple to use, multiple encryption-algorithms choosable, and, best of all

, open source. BTW: it runs also on linux/unix and mac. You should copy (not move) your files to that folder, and overwrite the original files with a secure-eraser program, try a search for "peter gutman" site:sf.net in google.
Gr33tz, Nemo