I’d been reading fool.com for investment advice for about two hours (yes, on a Friday night; I’m that boring) and noticed that my MBP was very hot - about 170F in the GPU diode (consistently the hottest part) according to iStatPro.
Since I was only running Firefox, and it was working fine, I couldn’t figure out why the computer was working so hard. I looked in the “Processes” pane of iStatPro, and saw that a crashed session of Microsoft Word from a few days ago was using 99% of my CPU cycles.
I switched back to Firefox, clicked the Apple menu, and selected Force Quit, then Word. Viola! The GPU diode temperature dropped 20F within 30 seconds.
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Yesterday, my MBP was running very hot while I was watching a DVD. Firefox was hogging cycles, so I switched to it and closed it. It wasn’t crashed; it closed normally.
However, when I opened it this morning, it told me updates had been installed. Not sure if that has anything to do with it.