Hi Listers
I have a G4 iMac whose Vram/Graphics chip shows occasional errors in the system log and freezes the machine solid from time to time. My hypothesis is that it appears to fail when the ambient room temperature gets to about 30 Celsius (which happens often in summer in Australia). RAM, CPU etc all work fine. The fan seems OK and moves air through the vents at the top.
I believe that the graphics chip is soldered to the motherboard so there is nothing I can do about that, but ....
1. Is there an app that will read/record internal temperatures to confirm that the problem is heat related?
Yes but it depends on OS. Check www.versiontracker.com under the appropriate OS for "temperature" or such"
2. Would a dismantle/clean be worth the effort?
Possibly, if the interior is particularly dusty.
3. Is there a way to check/clean/improve the internal airflow without the need to dismantle?
You can try using compressed air or "air in a can" through the vents.
One thing to try is to raise the unit up 1-2cm off the desk with sticks or such. The idea is to expose the bottom to air as much as possible. While presumably no air flow is intended here, giving it that space will increase cooling through the bottom.
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