After a heatsink and fan upgrade my cpu (athlon xp 1800) has gone a bit dead, the lights are on, 2 diff graphic cards dont work, the memory is sat perfectly and the hdd's aint showing any form of activity. It's strange because I put the fan and heatsink on perfectly, its the 5th time ive done this amoungst different computers and I have to say this time was the most perfect. The fan (volcano 9) is spinning, i did put a sufficient amount of compound on the die (artic silver 3) and i only put enough pressure on the clip to get it on the hooks (which went on first go without any struggling). If I buy a better cpu and put it in (like a xp 2200) will xp still boot? Or will it refuse to because to many hardware changes have taken place since activation? Or will it just need re activating? If it just boots perfect or needs re-activating I will buy a better cpu and a frickin copper shim, if it aint gona boot i will just buy the same cpu. any1 know? also, check that my guess that the cpu is the problem is right. thanks.