Hi
I just joined today to post this. I have had the same issue with the same model. Bought it at Best Buy in April, started getting random shut downs in May. What I did was go into the BIOS and turn off the smart fan option to get the fan running constantly. That seemed to work, I left it that way for a day, then put the fan back to normal settings and it seemed to work for about 6 weeks. Now today the issue has returned, as I type this my fan is going full speed, but the computer hasn't shut down. I tried changing the power supply, didn't work. I have an email in to Gateway support, but after reading around the web about this, I'm not to optimistic. I hope someone comes up with a solution though, the **** fan is quite loud and for $800 just for the tower this is unacceptable.