Mine has blown up 3 times.  Literally.  Flame, smoke, the works.  Had it fixed under warranty each time, but I really don't expect it to last this time either.  This last time it blew out, it was sitting on a cooling stand with 3 fans blowing air into it.  I clean it every few months.  It doesn't freeze or shutdown on its own before it blows up.

It's got 2 Nvidia 560M GPUs in SLI mode, and so far those are what seem to go out.

I just got it back from being repaired so I'm looking for suggestions on how to keep it cool so that it doesn't blow up again.