I search the past post and read up all the other ppl's problems with no sound/video. But I think my prob is a little bit different. It all started with hanged gameplay, then it went to hanged DVD playback, next was hanged anim logo at boot up. These probs usually get fixed if I turn off and back on. But yesterday I was watch a DVD movie and it hanged. After that, it won't boot. The usual off/on 3 times and xmax lights happened. Open Xbox and recheck connections, now the boot lights seems normal. But still no video/sound at boot up. I re-flash my OpenXbox mod and that went well. Same status. I am thinking could it be files in the HD be corrupted? I hear the HD booting sound seems ok. I tried booting Xbox w/o the HD and the lights function like when the HD was connected. You think prob is the HD? And can a 4GB HD replacement will work fine with Xbox?
FYI - Installation of OpenXbox mod went well and was able to play my backups for months without probs. Xbox hanging started 3 weeks ago. Only thing I installed in the Hd is xDVD, MPEG movies, Media Player. I mainly use the DVD movies and games so it's not overheating of HD (I think)