Help in resetting an HP-50G

[Joe Horn]

My guess is that the problem is not in the SD card. It's a takeover library of some kind in Port 1 or Port 2.

If you hold down the backspace key DURING a warmstart, it will prevent all the libraries from attaching themselves. This is a great way to keep a library in Port 1 or Port 2 from taking over your 50g, after which you can delete it using the FILER.

Method: With the calculator turned on, press and hold down the ON key, then tap and release the C (F3) key. Next, in very rapid succession, release the ON key and then immediately press and hold down the backspace key. Continue holding it down until the warmstart finishes. Press right-shift 2 (LIB) and look at the menu area. If you see no libraries listed, it was a success, so press left-shift APPS (FILES) and begin deleting what's in HOME and ports 0, 1, and 2. However, if you saw any libraries in the menu area, then you were not holding down the backspace key throughout the warmstart.