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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.

8A2476C8-FE9F-4C79-B641-34C7F5C845D1.jpeg

5316E9DB-ED04-492A-8B52-64DA5CA81DFF.jpeg

433B41C6-4E62-4443-A7D5-F25D022A73F8.jpeg

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