My temperatures have been running 70- 80 degrees Celsius constantly even when my Laptop Computer is idle. Lately, the cooling fan speed has not varied- it runs consistently at low speed. It had been working fine- speeding up and down as far as the R.P.M. The Motherboard temperatures are about 90 degrees and the hard drive temperatures are at 50 degrees and higher constantly. What could be causing the problem with the fan speed and what could I try to remedy the problem?