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I can't seem to enable ROM shadowing, or the system isn't working with ROM shadowing enabled
Explanation: You are trying to enable ROM shadowing in the system BIOS but the system is refusing to boot or behaving unstably when shadowing is turned on.
Diagnosis: Shadowing of the system BIOS works properly in almost every system. Shadowing of the video card usually works. Shadowing of adapter ROMs only works sometimes, depending on the system and on the peripheral. Turning on shadowing may reveal a general problem with the hardware, but usually if shadowing is the only thing causing the problem, the device you are trying to shadow simply isn't designed to work with it. For example, many adapters use both ROM and RAM in their address spaces, and shadowing will cause these to stop functioning altogether.