Hi guys...wondering if anyone can offer advice... I'm using an Advent model 3.4ghz Pentium Northwood. Sisoft Sandra told me that my cpu fan had failed. I'm pretty much a novice, but gritted my teeth and swapped out the heat sink with a new one. Sisoft still tells me it has failed.....or is running at 1400rpm. I've taken the side off and checked...and it is running, as is the case fan I added. I've also changed out the power supply for a better one, and that too is running no problem. The cpu temperature is around 48-50 degrees. Could anyone suggest what it may be? Any help much appreciated. Thanks in advance.