Can't turn off calculator

[Joe Horn]

Sometimes this condition can be exited by putting the Prime into "coma mode" (N.B. that's COMA, not COMMA). With the calculator turned on, press and hold down the Shift key, then (while still holding down the Shift key) press and hold down the On key for at least one full second, then release both.

Turning on from coma mode takes about three seconds; just press On and be patient. Afterwards, turning off and on should be like normal.

This was a known bug in some firmware updates in the . The bug is activated by exiting the C+F+O diagnostic screen by pressing 9. Don't do that; exit instead by pressing C.

Please let us know whether the above helps or not.