Just got myself a 360 from my older bro, it's one of the first HDMI models, and is absent of the casing. Basically the DVD drive won't turn on, it's like power isn't getting to the DVD drive. I've tried 3 different drives with no result, also tried switching SATA cables and still nothing. The fans power on and everything else seems to be working on it. So what's the basic problem? And is it easily fixable?