The 12 page manual that came with the machine, many many many years ago, does not tell us how to troubleshoot the problem we are having with the LCD window. Until last week, we could read which "mode" we were in. We unplugged it to repair the paper-drive, and when it was plugged back in, the LCD indicates nothing. no words, no numbers, we do not know if we are in FAX mode, or SEND mode, nor RECEIVE mode and so on. Can you help?