I have the same problem on 2 units, after replacing that third on-board fuse in both units and testing both of them. Neither of the displays would turn on.
The LED is blinking/pulsing in and out with almost no pause between, and the onboard power LED is just solid red.
I haven't tried using a known good display yet, but when I get home I'm going to try to put the mk2 display board into one of these units. I'm just curious if there is anything else besides that third fuse. The top two fuses are still good, and never bad.
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Oliver
mk1 30gb: 129 | mk2a 30gb: 040104126