i have fixed a few RROD issues for some of my friends in the past few months with no issues. however, i am trying to fix another one and have hit a wall. i noticed once i took the 360 apart, the bottom of the motherboard had four thermal compound places adjacent to the x-clamps. i have opened numerous xbox's and this is the first one i have seen with these compound places. the second issues i noticed, was that when you turn the xbox on, the screen just stays black the entire time....never receiving an on-screen error message. i replaced the x-clamp with the normal method of screws and washers and the RROD persists. Has anyone else had this issue? Any help is greatly appreciated.