HP-50G screen black at startup...

[Joe Horn]

(08-30-2023 04:52 AM)Peter Murphy Wrote:  ...and contrast is not adjustable. All was working fine a few days ago. Please advise.

The "three-finger salute" (AKA "Vulcan Nerve Pinch") resets the contrast to its default. Press ON and F1 and F6 at the same time. When "Try To Recover Memory?" appears, press NO (if nothing happens, press F5 then NO). Recover your 50g's contents from the backup you prudently keep in Port 2 or Port 3.

If ON+F1+F6 doesn't launch, try poking a paperclip into the RESET hole in the back first.

Good luck!