CP900 fails to boot (shows Canon screen but never progresses)

Even after disconnecting power for 24hrs, when powering on my CP900 shows the Canon screen but never progresses past that state. Is there a way to hard-factory-reset at power-on ?
Any other ideas or solutions to revive it?

One thing - I assume you've unplugged all power/leads from AppelTV for a few mins and tried again.
You will not be easily able to replace the hard drive as all the software is on it, so unless you had another AppleTv to dismantle and copy the drive (PATA not SATA 2.5"), you couldn't just stick a new drive in - there is no utility to rebuild the software on the drive available to the consumer.
No way I'm aware of to perform diagnostics if you can't do the reboot to diagnostics remote sequence you mentioned earlier.
Personally, unless you have a 2.5" PATA caddy/adapter lying around, and are prepared to dismantle and play, I think you'd be better off getting a replacement device or even a refurb from Apple with the same warranty.
By all means enquire at your Apple store if they can repair, but I doubt it'd be offered or even economical.
If you're happy to dismantle you could test the drive to see if it's alive using a PATA 2.5" drive connector/caddy connected to a Mac.
While it might be another issue, I think the grinding noise and ? flashing really point to it being unable to find a boot volume due to drive failure.

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How did you check this?
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Did you try to reinstall the webcam software?
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CP900 fails to boot (shows Canon screen but never progresses)

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