I have a Toshiba net-book that a customer brought to me and the system is over-heating to the point that it will shut itself off or simply quit working. I took the net-book apart and applied new thermal grease and made sure that there was no dust or dirt clogging the air flow. It still runs 78C to 80C with the processor idling (no programs running). The heat-sink does not seem to be transferring any heat to the fan because the fan is blowing out cold air and running at full speed. If I use compressed air and blow directly on the heat-sink where the processor is it immediately cools down to normal temp and the fan slows to normal speed. The customer told me when the net-book was new the fan ran normal. What can be done to resolve this issue? I went into the BIOS and could find no setting relating to the processor performance. I set the BIOS to factory default hopping that would help, (I have did that before with another laptop that was acting the same way), but that didn't help either. I up-loaded a picture of the heat-sink for you to look at.