I recently installed Ubuntu 13.10 64 bit (dual boot with Win 7) on my desktop PC, but every once in a while the screen turns off suddenly, the fans slow down, and the system appears to crash. I can't see what actually happens, because the screen turns off (no input), but the sound crashes too. All I can do is to press the reset button on the computer itself, after which it boots up without any issue or mention of a problem.At first this happened randomly and unexpectedly simply from normal use, just by opening Firefox or moving the cursor around the desktop right after a clean install. Now it seems to happen only when I do something CPU intensive, like watching videos or importing my music library. I'm not sure what changed, because all I did was turn it off for a day and then come back.I've since cleaned the inside of the computer for dust, and all fans appear to be spinning.The system specs are:AMD Phenon II X4 965 3.4 GHzATI Radeon HD 4870, and Ubuntu says the driver is Gallium 0.4 on AMD RV770
Sudden crash and black screen in Ubuntu, possible overheating
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