G4 MDD freezes when CPU gets hot - why?
From a cold start the CPU (Dual 1.25GHz) temperature rises until it reaches over 50°C in about 40 minutes, when the G4 freezes. The HD remp also rises steadily to 35°C. I have to press the start button to shut it down.
I have cleaned all dust and fluff out of the machine, checked that all fans are working and replaced the heat sink grease and still it happens.
If I open the side door and use a small external fan to blow cool air over the heat sink the G4 operates normally for hours with the CPU temperature at a steady 35°C and the HD at a steady 26°C.
The technician (Apple Genius) at the local Apple Shop said they did not have the gear to check everything on such an old model
Mac, but all the sensors checked out OK and he thought the problem may be an ageing CPU. What do you think?