I made a video of the problem which can be viewed
.
When I had the 128k ROM in, it threw an error of 04E925. I slapped the 512kE (Plus) ROMs in, and the error code changed; 0
3E925. The second digit changed, the others stayed the same.
04=failed Mod3
03=failed byte write
And all of the times I rebooted it, the last 4 digits always stayed the same, E925. Could this mean there is a problem with the ROM and the RAM (or RAM decoder chip)?