SYSTEM ROM ERROR

The system ROM's checksum was found to be incorrect. This error is rather rare because a bad readback of the system ROM would often cause the system to crash or get stuck in a boot-loop before being able to show the error.

• PCB damage ? Address lines from the 68k may be cut. If so, it's probably the higher ones.
• Did you buy that UniBios on eBay ? Check that the EPROM is fast enough.
• If an EPROM is used and its window isn't covered, it might be partially erased. Erase it completely and reprogram it.