Heat/GPU issue killed my first 17" Apple Macbook Pro. Just as 3 year AppleCare ended.
Heat seems to be the reason ethernet in my mac mini randomly dies every few days and the fix is rebooting the switch it's connected to. https://discussions.apple.com/thread/1341108?start=45&tstart... I believe a heat sensor either correctly or wrongly detects high heat and disconnects ethernet. It's never shutdown completely though.
My last iMac screen was burned in just as 3 year warranty ended due to high cpu heat over the 3 years. The burn in happened right where the cpu was located.
And current imac is even thinner, meaning less space for air to flow, which is why I'm forced to buy Mac Pro for my video editing. iMac would be more than enough for my need but I know the monitor will get burn in after 3 years and so i will just go for mac pro. At least it has good cooling system or so I hear.
Well played apple. Well played.