I/O Card Parity Interrupt @F000:BAFC

Upon boot up on a Dell OptiPlexGX110 running 98SE the following message appears on a black screen:
I/O Card Parity Interrupt at F000:BAFC (AC57, 6D75, 319A, or BB51)
Press (S) to Shut off NMI, (R) to Reboot, or any key to continue.
R reboots but comes back to the black screen with another I/O line message with different location.
Any key brings another I/O line message different location.
S continues the boot and the PC seems to work fine.
This machine is connected to network in a work enviornment. Server is running 2000.
Any thoughts out there?