As I currently use a cheapo bog standard cpu fan for my athlon 1.7 XP, it makes quite a bit of racket but I've never really had any problem with this. However, over the past few days, its started playing up big time - whilst using the computer, I find that the whine of the fan 'rises and falls' (normally, its just a steady whine) indicating changes in revs and simultaneously, the graphics become corrupted, usually when the fan slows down. More often than not, the fan will speed up after a while and the corruption stops but on some occasions, the screen becomes obliterated with cross hatching, errors and is totally unusable - the only course of action is usually to reboot. I guess that the fan slowdown may be causing the cpu to overheat and create the aforementioned errors - as I'm in the process of purchasing a copper block (slk? 700), I'm hoping that this will alleviate the malady but can anyone offer any insights into this as I MAY be wrong???!!