Another thing to check is your BIOS settings and see if you still have your HDD as the primary boot device.
Running XP/SP3. Upon booting, get DOS screen showing: PXE-E61 Media
TestFailure, Check Cable PXE-MDC Exiting PXE ROM All cables are connected;
checked both the hard drive and CD Rom,by exchanging with good ones; same
problem. Any help will be greatly appreciated. Thank you.