since i upgraded to windows 10 from 7, my pc sometimes wakes up from sleep mode without turning the monitor on then goes right back into sleep mode. real weird never experianced this problem before. here are my specs. asrock z77 extreme 4 motherboard, i7 3770k cpu, 8gb of corsair dominator gt ddr3 ram, gigabyte amd hd 7970 ghz edition video card.