This got the heat under control, but it looks like the damage was done. Ended up building a special vertical stand (Mini's venting is rather poor) and installed "Temperature Monitor" by Marcel Bresink Software, which I recommend, and uninstalled some things (including killing a Mac update process that was running constantly). I saw early heating problems with this after 10.9.5 upgrade. It does sounds like heat related warping. I'm not going to get into "loosening screws" as suggested in linked discussion, but that may work for a powerbook. It appears the only real fix is a new logic board, which appears is almost as expensive as buying a new machine. Hardware test appears to just ignore an empty slot, so really not helpful (and won't boot with filled slot). Tested both chips in both possible slots, but will always get three tones when either chip is in top slot, fine when that slot is empty.
For about two weeks I could get it to reboot by unplugging and giving it some time. I had constant crashes at sleep beginning about three weeks ago, and three tones at boot. As in that linked tread, overheating after OS upgrade (in my case, Mavericks) seems to be related. I'm having the same issue with a Mid-2011 Mac Mini (purchased June 2013). This seems similar to this problem, mentioned in a number of threads covering MacBooks, best described here: MacBook Pro loses access to 1 memory slot upon shutdown or reboot in OS X 10.8.1
Mac Mini (mid 2011) ram slot has failed: Any others experiencing?
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