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Juan Largo

 
Member Since: Jan 31, 2008
Posts: 195
Juan Largo has a little shameless behaviour in the past

Juan Largo is offline
Your symptoms sure sound like your MB is overheating -- even though your CPU appears to be operating within normal temperature limits. It might not be the CPU that's overheating -- it could be the GPU instead. The fact that you hear a fan right before the lock-up sounds like it's temperature-related.

Try increasing fan speeds with SMC Fan Control, run with increased fan speeds for a while and if that makes a difference. If it does, then we know your problem is temperature-related.

Link: Controlling your Mac’s fan speed with SMC Fan Control (with step by step guide) « David’s logbook

iMac G3
600 MHz
OS 10.3.9
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