Id first check to see if the connectors are tightly screwed to the computer, second check for broken cables... if none of that I'd send I'd put it aside and get a nother monitor... repairing it will probably cost you more than buying another second hand.
If your 1438 is the one with Amiga 23pin connector (instead of the standard VGA connecotr) I don't think the PC folks could fix it... as far as I know there's not a Amiga Mon->PC converter (perhaps one could be built though).
