I received and set up the computer with no problems. After using it for a week or two, I closed it down and used my other computer, a desktop, for two or three weeks. Just now I powered up this ASUS laptop and after signing in, it went into sleep mode. I got it to wake up again and rebooted it. After going into sleep mode a second time, I once again pressed the on button and it remained dark. After pressing it again, the screen came up a deep blue with the white mouse arrow visible, but nothing else appeared. A Google search turned up the fix:Unplug it from the power source. Press and hold down the on button for several seconds, or until the machine totally shuts down and the light goes off. Then press and hold down the on button until the machine boots up again.That's what fixed my problem.