I recently installed an Aero 7+ Heatsink/fan on an Athlon XP 2400 on Asus A7V333 mobo. I used Arctic Silver thermal compound on the heatsink and cpu die as per instructions from Arctic Silver website. The heatsink mates properly on the cpu die but the motherboard reports temps of 85 degrees immediately when I turn on the computer and then shuts down automatically when it reaches 90. I've tried reseating the heatsink, cleaning cpu and reapplying thermal compound, with/without copper shim, all with the same result. The heatsink is not even warm to touch, nor is the cpu. This seems to indicate a false reading. At first I thought that I may have gotten Arctic Silver on the diode and shorted something out but the temperature sensor for XP processors is a diode inside the die itself so that rules out that theory. Could this possibly be a motherboard/bios issue? Is the cpu fried? Thank you to anyone for help on this matter.