Random freezes and buzzing sounds??

[cooterteef]

I've had my xbox modded for about a year. For a long time no problems. I put in evo-x and some other apps. and a few months ago I began to get lock-ups during game play or even at the browser and a buzzing sound in the audio. So I took off evo-x thinking it would do the trick but still it does. Sometimes I can play without it happending other times it will over and over. I always have to power off the machine and try it again. The screen freezes on what ever frame it is and the buzzing starts.

Any help is appreciated. I am thinking either something in HD or maybe a solder point has gone bad.
It almost sounds like when you have a bad ground in an amp or something. That kind of buzz.