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Model A1103 / 1.25, 1.33, 1.42, or 1.5 GHz G4 processor

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What is the daughter board next to the CPU heatsink in a Mac Mini?

I have opened up a Mac mini A1103 and removed the drive tray carrying the CD and HD drives. There is a small daughter board mounted on 2 posts and covered in black tape, next to the CPU heatsink. The screws holding it to the posts are cross-head, and done up so tight I cannot move them. Ddes anyone know what this does? As the machine does not boot and does not seem to produce any graphics output, I am wondering if the little board has the GPU on it.

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Is this the part you are thinking of?

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Yes, that part exactly. Further examination has revealed a cable running from the board to the modem socket. I believe the modem was an optional extra.

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