It looks like no one has dealt with this in almost a year, but my 14 month old SP3 has been doing this periodically, until last week when it would not come back on at all. Last night, my computer tech again played around with all the options noted above, set it down, then accidentally touched it half an hour later and it came back on. I backed up, then tried to upgrade to 10. All night it said "Waiting on reply", so I rebooted and am now back to the same problem. Dead black screen. Did not drop it or hit or anything and it was 100% battery full when I rebooted. Microsoft wants $450 for a reconditioned one. Any other alternatives? Is this just a lemon or are there fixes? I'm really tired of not being able to count on this computer!