Win7 64 bit. I use sleep mode just about all the time. However, sometimes when I come out of the sleep mode, I get a blank a screen (no picture on the monitor) and have to reboot with Windows running. I then get the "delete restoration data & proceed with system boot menu ". Everything usually works ok, but once I had file damage. Any idea why this happens coming out of sleep mode and what can be done to fix it? My computer is about 2 years old.