My Acer Aspire E 15, with Windows 10, doesn't wake up from sleep. The power light remains on, and sometimes the keyboard is lighted too, but the screen is blank. Attaching to an external monitor doesn't help either. I have to do a hard reset by holding down the power button until the power light goes off. This happens several times a day, and has been a problem since I purchased the computer. I actually sent it back to the Acer laptop repair center, and they tightened some cable and then returned it. I suspect the problem is with Windows 10 interacting with the machine. Super frustrating.