I bought an Xbox 360 off of Ebay, WIth th 12V mod From the DVD to the fans, When I got the system it worked just fine, I played Gears of War for hours with no problem the system never froze, SO I started playing some other games, and I most them froze, Some didnt Like Ninja Guidan Worked Fine, Gears of war, ran perfect, but games like PGR 4 froze, Blacksite area 51 would freeze, and now Rainbow Six vegas freezes, SO I got Fed up and took it apart and here are the things I tried, I took the Dvd rom apart and Adjusted the pot, all the way from 2.8k to 4.80k in .2 Increments, PGR4 would still freeze, and it doesnt do it while in the Game only while its loading, and its random, not at the same point, the Disc is near perfect so I know its not that, After trying that I assumed it was the Drive so I ordered a new one, its on its way, but today I decided to try it without my hard drive, the game ran perfect, No freezing for hours, So then I though ok cool its my HDD, well I borrowed my friends HDD which works fine in his XBox and tried it on mine, Same problem it freezes, SO now I dont know what to do, I can play without my HDD but whats the point I cant save, has anybody had this same problem and fixed it? Also I already tried the Cache Clearing in the Consoles Blade, and the System reset while holding the Sync button at startup, no help still freezes.