I dont think HD will makes a difference since all the games are output at 720p then either upscale or downscale according to your display. Also you said you're in jakarta now? iirc mobiusvyper had the same problem sometime ago when he was there, he said the voltage was not stable or something.

Like i said before,playing on normal tv or HDTV is not the problem since the signal coming out from your xbox already at HD level (720p). Most of this 3ROD problem are just random, like unkool machine 3ROD just after 3 days of usage while my friend in the US been using his 360 from launch until now no problem whatsoever and yea my friend playing on a big arse HDTV, not sure about unkool though but i think he only use his monitor.