My 510c has been doing this, too! It just dies to black screen at any time for no apparent reason. It did it the other day during a business presentation. That sucked! I believe it is a flaw in the model design or something. I had this problem last year and the folks at MSI took it in twice but could not replicate or fix the problem. They claimed to replace the mb at one point. Then the good folks at xmeld swapped out the entire barebones unit for me, but I'm still having the problem. I changed hdds, too, but still the same problem. I don't think it's a matter of cleaning the fans. It has gone dead even when I was first installng Windows fresh out of the box. Has anyone else with 510c/1003 had a similar problem? I'm getting ready to send it back to xmeld again, but without knowing the problem, I'm considering a change, possibly to the 510's replacement: the 1016. Anyone know anything about it?