Alright, you guys know how when you break your computer or when it doesn't boot up, you take to ethier Best Buy or one of those computer repair shops? What I was wondering is, how do they find out the problem wheter it is the motherboard problem, graphics, processor, memory, or hard drive? What kind of tools did they use? Well, I have a computer and it doesn't boot up at all! I want to know the problem. I'm looking for a tool that detects it, don't care how much it is, I want to know if its the power supply that is causing it not to boot up, or the memory, motherboard or processor. If you know of a tool, please share. I'm looking for products you plug into the computer, not programs.