..- = U
this sounds more as a bad connection. First, check all the cables for keyboard, modem, printer, scanner, drawing board, network etc...to sit as tight as possible.
If no success, switch off machine and open the case and check all cables inside, all cables from the motherboard, all harddrives, floppy, zip drive etc...all cable!!!!
test again.
If no success, switch off machine and have a look at the dust around the machine, pull the cards and use a smooth brush to clean everything.....yes, everything, take the RAM out etc.
test again.
If no success, report further...
