I've searched the board and found out that the problem I am having may be due to a bad power supply.
Here are my symptoms:
1. Xbox starts up without any animation
2. It suddenly turns off
3. It starts up again with any animation
4. It turns off again
5. Finally, it starts up again with a blank screen, no animation, and the front LED is flashing.
Does anyone have a solution to this problem? Can I replace a fuse? Is it definately the power supply that is causing all my problems?
I have a Matrix modchip and I realigned it and I still get the same problem, I have a WD 120gb HD as well. My Xbox has been working fine, I have not adjusted any settings, I just turned it on today and had this problem.