Are you manually turning it off and on? Or does the computer restart automatically when you plug in the power adapter?Laptop gets restarted when the it is connected to the mains.After switching off and on two or three times the computer comes to life
On either computer can you restart and press F8 continually, Then in the Advanced Boot Menu, choose Safe Mode?
On the desktop, in the Advanced Boot menu can you choose Last Known Good Configuration? Or VGA Mode?
On the laptop, turn Hibernation Off