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Lisa checkerboard pattern

nickpunt

6502
Just got the power and video boards of my MacXL / Lisa 2/10 recapped and it boots with two high beeps to this checkerboard pattern. I can't find any reference to this in any of the repair guides. Anybody have any idea what it might be? We've already tried reseating the boards.

Prior to recap it was getting to boot screen, the video was just flickering / unstable (attached as well).

Thanks!
 

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