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Problem: No shift functions work.Part of the shift function design means that to avoid "stuck" keys, shift functions are disabled when any key is pressed. So loss of shift functions means you have a shorted or stuck switch. Problem is, which one? There are two ways to determine this. The on-board LED gives an indication of which input is shorted, see later in this section.Or use the built-in test mode:Run any text-display program such as Notepad, or if you are in DOS type "COPY CON" to turn off the command prompt. With a keyboard plugged into the pass-through port, press CTRL-ALT-P (press and hold each key in this order). You will go into programming mode. If the MAME/ALT jumper is set to MAME you will go right into test mode. If not, you will see a menu. Enter "T" for test mode. The offending stuck input(s) will be displayed on the screen.