Computer, with factory installed Windows 10, had adware popups, so I installed Malwarebytes. While it was scanning I left the computer unattended about 1 hour. When I came back to it the power button was flashing, screen was dark; appeared to be asleep. I could not get it to wake with the mouse or keyboard. I held down the power button until it powered off. After 1 minute I turned it back on and it whirrs, but nothing comes up on the monitor and the power button continues to blink. I have tried restarting it and hitting F8 to try a SafeMode start, but it's not booting to anything - still a black screen. The Farbar Recovery Scan Tool link says I can't use it on my computer (Windows 10). (I have two of the exact same computer, bought for twins going to college this fall, and tried to download the recovery tool onto the one that works so I could transfer to a thumb drive.) The computer is a Lenovo, 64 bit purchased new in late November 2015. The 90 day "warranty" from Best Buy just ran out last week. My son likes to play video games online and this is the second time McAfee has let adware through onto his computer. Because I can't get beyond a black screen there is nothing to send in the way of a log (couldn't run Farbar anyway). I do not have an original boot disk since it was factory install and I did not make a recovery disk when we purchased it - bad decision I think. I appreciate any help.