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I noticed my CM3588 was not connected to the network and when I checked on it the red power light and the red sys light were on, but there were no other lights. When I restarted it, the same 2 lights came on at the same time, but nothing else happened. There was no signal to the monitor.

Is there a list of what the LED lights mean? I'm not even sure where to start troubleshooting.

I have the CM3588 (not plus) with the NAS kit, running Open Media Vault (OMV) on the eMMC.

Any help would be much appreciated.

You'll need to monitor where the boot process stops.

Connect a USB RS232 adapter to the DEBUG-UART connector.
Open a serial terminal app (e.g., PuTTY) and set the baud rate to 1500000 bps