I will first say I read the similar threads and none of them applied. Secondly, this is a home build that is nearly a year old with no issues to this point so it's not connected to so-and-so who released a driver update that I know of. I want to say 2 days ago, my computer has decided to fail when going to sleep. It is Windows 7, completely updated with no problems to that point. When it falls asleep and I wake it up, the machine starts up and is active, but my monitors and external hard drive are never turned on as they once were and the machine just sits there running with a black screen. I restart, boot back into Windows and it says resume (as if it was in hibernation, but I have hybrid sleep on) and I just get a flashing underscore and no more. I restart once again, it says Windows could not restore the session, I start a new session and all is good again... until the computer falls asleep and the process starts over. I have tried turning off hybrid sleep. No good. I have tried using hibernation instead of sleep. Same error. I found online where someone said they had this problem with an ATI card, but once the upgraded the Catalyst Control Center and drivers, they had no problems. That did no good. The only update I've done recenly is Firefox, but I have not seen any other reports of the newest Firefox causing sleep problems. I read where someone had a problem with waking up from sleep mode because of Firefox's memory leaks and they said closing Firefox before putting it to sleep helped. No luck for me. It does not matter if I put it to sleep and wake it up immediately or if it goes to sleep and when I get home from work, boot it up. The same thing happens no matter the length of time. I have a dual boot with Ubuntu, but that has been on there for months with no errors and Ubuntu will sleep and wake up just fine. There have been no hardware changes or any hardware driver changes other than the video card. I tried rolling back video card drivers to see if there was a difference with no change. My ASRock MB has the most up to date BIOS that has been out for over a year. My video card is a 5770, but like I said, I've tried older and new drivers. I tried the prevx black screen fix with no luck. I saw the Windows hotfix for this problem, but no where did they provide a link to this hotfix so I'm assuming it was downloaded in an update at some point so it is doing no good for me. The simple solution is just to shut it down every single time I don't want it on... but that is far from the best solution. But I'm at a loss as to what could be wrong.