It only took some time, some fearlessness of electronic confusion, and Bing searches and Youtube. But I've fixed my 360's DVD drive failure. It involved turning one tiny screw 1/4 of a turn to the left. But i had to open up the 360 to do it and what a PAIN IN THE ***. Anyway, back to normal. Wish I would've thought to do all this stuff when it failed on me before. Each of the times before :/
Yes it is very odd that one tight or loose screw can determine if an Xbox will work properly. Probably the main problem people have with their Xbox's.
I believe this screw I adjusted had to do with the power to the Laser. *shrugs* Oh well, its working and I am happy.