If one sleeps the laptop, then wakes it, or restarts, the screen back lights, then goes black, and repeat - the Dell logo does not appear. The only way to boot is to long press the power button for shutdown, then on. I've tried BIOS update, SFC / scannow, Dell driver updates, Glary scan, and disk check, with no joy. Also removed battery, and held power button down.
Any ideas?