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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 something on the backplane is not 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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