0011 over heating - If you are receiving this error after disassembling your console make sure to all 8 of the heatsink screws are tightened securely to the board/heatsink holes. This error appears when the CPU overheats. The heat can't be dissipated to the heatsink and/or the heatsink isnt cooled properly. This can be caused by improper thermal compound usage or if the error comes up instantly while booting the console, the heatsink will likely not be making any contact at all with the chip. In rare cases it can also be a faulty temp sensor. From [http://xbox-experts.com/errorcode/E05/0011/|here] and [http://www.llamma.com/xbox360/repair/Xbox-360-error-codes.htm|here] for more info. Hope this helps, good luck.