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    Apple //c won't boot

    Hi, I have a Apple //c, board 820-0115-C. I am getting a video signal (see picture), but no boot. I have replaced MRD7 RAM, 80 DIR, Video Latch, tried an alternate CHAR GEN and burned a new MON chip. I have tried my spare CPU, MMU, and IOU chips. Any suggestions of what to try next...
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