I have an Omen 25L, a day old, and it won't wake up from sleep mode. It's fine if it's playing tv or music, but if it's inactive and goes to sleep, you can't wake it up with the mouse or keyboard, and the power button does nothing. You have to turn it off and on again at the mains. I've seen before that there's a possibility it's a corrupted version of windows, and to update the Nvidia driver, but I've checked and my driver is up-to-date.