PXE is a Windows “Pre-Boot Execution Environment”. Its primary purpose is to provide the ability to boot from a network using your lan card if you have one. You should not have it enabled. There should be some option in the BIOS that specifies booting from an IDE hard drive. That would be the setting that you should be using.

Another possible cause could be a miss-wiring of the Control and Power cables. This has happened before and may be what is causing your problem. The “Drive 1” Control and Power cables must go to the same drive. You can check if this is the problem by connecting the power cables directly so all drives power up. If the PC boots you know you have the power cables crossed.