I have a rather powerful machine, and during 1 week that I had boinc run jobs on the seti@home project it crashed many times. First I thought it was just the GPU as the system would only show a black screen but the mouse cursor would be still moving when I moved the mouse. But even after I disabled GPU jobs, my computer would not allow me to login showing only a black screen. This never happened for the last year that I have been running this computer 24 hours a day. So I am sad to say, boinc and seti@home are out.

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Have you ever cleaned out that machine? As when you run 24/7, it'll suck up dust, which goes and sits in all nooks, crannies and fans, thereby adding lots of heat and making the machine slower and/or crash.

Ever checked temperatures, with a program such as Core Temp, or more BOINC specialized, TThrottle? GPU temperatures can be checked through GPU-Z.

Of course, just walking away is the easiest method. But if you don't try to solve the problem, anything else will eventually cause it to crash as well.

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