CrazyDawg,

assuming that's accurate, 48C (about 120F) is ok but at the fanspeed youre running to achieve it is more than twice what it should be. I read last night that unless ti goes over 150F it's ok   The same article said that for example an Athlon's sustained max temp can range as high as 180F somewhere around 85-90C and still be ok

What you were experiencing; the rebooting, is part of the throttling process - clock speed is slowed down if that doesn't work it reboots the computer - it indicates that the chip's safegaurds are working and the chip is probably ok because of that.

I would carefully remove the cpu cooling fins(heat sink) from the cpu and check for grease as was previously sugested - only do this yourself if you are mechanically oriented and can take things apart and fit things together without forcing them. It's sort of delicate work.

Also high air temperature, lack of air circulation and high humidity can severely affect cooling.

  -TJ