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A single blinking “D” appeared in the upper-left corner of a Cordata PPC-400’s screen when a restorer powered it up. According to the restorer’s account, the PPC Diagnostic Procedures Manual identifies that display as a failed DMA controller self-test. Before ordering a replacement chip, the restorer examined the installed BIOS and found routines for displaying D, T, I, and K, matching the codes described in the manual.
That check gave the restorer a reason to trust the manual’s diagnosis for this particular machine. For anyone facing an old computer that will not start, one blinking letter is a remarkably useful clue, provided its meaning can be checked. The account says a replacement was ordered, but does not report a completed repair. Will replacing the DMA controller get the PPC-400 running again?
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Questions worth exploring next
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- Will replacing the DMA controller restore the computer? : Still exploring
- What do the other BIOS diagnostic codes indicate? : Still exploring
- What software is on the original hard drive? : Still exploring
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