I've got a MacBook Pro 1,1 that is having an issue. It shut itself down for the first time last week and has continued to do so with increasing frequency, presumably due to overheating. This occurs when I've been gaming for long periods or when watching movies. Before it shuts down I can hear the fans running on high and the strip above the keyboard is hot to the touch. It has always run a little hot, which I've heard is normal with the early MBPs, so I bought a cooling pad and use that when I have the machine doing CPU/GPU intensive tasks. In the past that was sufficient and it was able to handle these tasks without a problem. Not so anymore. It gets very hot and the shutdowns even occur with the cooling pad on.
It seems to have started running hotter when I installed 10.5 right after it was released, but this could be a coincidence. I have tried resetting the PMU a couple of times over the past couple of months and has it made no difference.
I have installed a temp monitoring app and I will try updating the firmware tonight.
If that doesn't work, what are my options? Do I need to reapply thermal paste?