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In Run/Mat screen, press the sequence [OPTN][F6:>][F4:NUMB][F1:ABS]. This will enter the abs( function on the command line. Complete its arguments (the expression inside the absolute value) and close the right parenthesis, then press EXE.
It sounds like you have a bad connection..either in your wall socket, or the electrical cord on your cal. is getting old or shorted where it connects to your cal. If it is not these connections, your may have dropped a staple or paper clip in your cal. turn cal off and shake machine to dislodge it. turn cal back on see what happens. if it starts to smoke, etc. etc, this was your problem and you need a Monroe cal. good luck
You need to have numlock on - even on a laptop. It's not very helpful like that because you typically can't use half the keyboard. Anyway once NumLock is on select PC or CAL. In CAL mode just type your calculation, get the result and press SEND to deliver the result to the PC, wherever you are typing. If you press PC mode the screen changes on the LS-120 and keypresses are sent through directly as you type them with no calculating done (like a numeric keypad).