imac 20 inch mid 2007
I have am iMac 20 inch mid 2007 that keeps shutting down by itself. Is anybody familiar to this?
iMac, OS X Mountain Lion (10.8.4)
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Sounds like either a problem with RAM or it is overheating.
Run the Apple Hardware Test in Extended Mode to see if it detects any hardware problems.
1. Reseat and/or replace the RAM modules, as per How to remove or install memory
2. Have the iMac checked and cleaned. If it is full of dust or has a bad fan, it will not cool properly and shut down.