I have seven Lexmark 24xx Dot Matrix printers. Six of them work fine with HP JetDirect Print Servers (Either a 500x or 170x). The seventh worked for a while but now refuses. I have tried a new print server, no good. The printer will print fine when directly hooked up using either the parallel port or the USB port. I have tried switching parallel cables. Nothing seems to make a difference. Any ideas would be appreciated.