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I am having issues with my Macintosh 512k.  The machine will usually boot with the checkerboard pattern shown in the pictures.  Sometimes it will make a very distorted sound on boot.  The issue is not with the crt as it has been tested with other boards.  Occasionally the checkerboard pattern will change. 


I suspect the the issue is with the roms installed.  I have tried cleaning the roms but this does not change the issue.  I am curious if any one else has ever had a problem similar to this.




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