I've built my own computer about six months ago and after using it happily for all that time, it decided to blow up. It seemed like the power supply had gone so I bought a new power supply but now I can only get one of the hard drives to work. If I leave the other plugged in, the computer will not boot. Is there any way I can test the seemingly broken hard drive? I'm using a 300w Quietpc power supply. My old power supply was also 300w. Any ideas?