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What does no Ready light on a Quantum CPU indicate?

The Ready light is an indicator that the CPU has passed all of its internal diagnostic checks.
If the ready light is out, try powering up in a backplane with only a power supply to make sure that nothing on the backplane is causing the issue.
If possible, power up with a different Power supply and backplane.
If the ready light does not come on under any of these circumstances, it indicates a failed CPU.
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