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What happens if you go one step back in the menu, remove the disk and press F5 for signal test?
I expect that you get "CHG" in addition to WPR and TK0.
Is this the case?
If you don't get CHG when you press the signal test without a disk in drive, the disk present-switch which solarmon mentions is defective or need a good clean.
That can explain that the computer recognizes only the first disk, meaning the system does not detect a disk swap.
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