APOLOGIES IN ADVANCE, as I am a NOOB here. I'm trying to sort out a Thermal Shutdown issue with a P3 that is only used for word processing and other simple tasks (reason it is not being replaced). After checking things out with the BIOS toolkit and disabling thermal shutdown (for testing only), I monitored temps with both Speedfan and Everest (similar readings). What I noticed was that Temp1 (LM 78 chip) was all over the place, jumping from 42 to 120, then down to -110 c, with no discernible pattern to the jumps. The other two temps that Speedfan found remained nice and constant at expected values. The other thing I noted was that power monitoring (speedfan) also showed considerable fluctuation, with all 3 rails often showing well below target voltages. I have checked and cleaned all cooling system parts and am happy that the cpu is NOT actually running too hot, but I would like to work out what is happening. Could the fluctuations with the PSU be causing the LM78 to read incorrectly?