These guides are great! I recently purchased a second hand Xbox 360 and didn't test it properly prior to taking it home (Stupid I know). Well long story short it had the infamous RROD off and on and wasn't being an overall happy camper. I performed the repair myself now and have a fully operational system, and to top it all off have expanded my little PC repair business to encompass Xbox and PS3 repairs. Keep guides like this coming, really helps out.