The MkI sled connectors were a bit finnicky - tended to regularly accumulate dirt... At least caused static on the pins carrying the low level out signals. Cleaning with alcohol and tops helped, until next time.

For it not to spin up the drives properly, I'd suspect the power pins... Do you get the battery indicator? (But that seems to be coming on for other reasons in v2.0beta13 anyway)

/Michael
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/Michael