Have you looked in the BIOS to see if the serial ports have been disabled?




I have a Dell 4100 933 MHz machine with a palm III hooked to the serial port.  It ceased to hot sync and subsequent troubleshooting indicated the serial port had failed (palm and cradle/cable are good; they work fine on a second machine).  The System device manager said all was fine and there were no error messages.  I bought a PCI serial card installed it; which went fine.  System device manager is fine, but like the original port it will transmit no data.  In both cases the ports were configured as COM 1 using interrupt 4.


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