I am using 1 Official MS controller in port 1, memory cards are removed, DVD dongle removed and I have tried 2 DOUX 2 chips with the same result. I put the Aladdin back and it is perfect?

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Finally when I sort out the problem am I right in assuming I need a 512K bios file? I know it has a 1Mb chip split into 2 x 512K banks but I assume you flash them seperately with 2 512K bios.bin files and not a single 1M.
Thanks for trying to help, any other suggestions would be greatfully received.