I've been happily running my Promise3 R6 for quite a while now with no issues. Went out of town and unplugged all devices from power and shut down. On return my R6 wouldn't boot. I created a support case and after doing the regular cable swaps etc, it was suggested that I eject the drives part way and try and power up, then insert the drives. This actually worked once. However, on rebooting the machine the same thing happened.
I had Apple replace the logic board twice with no luck. System profiler shows the Promise connected to the TB port. I've used the commands to load the extension (which I previously didn't have to do). I can also power a second drive from the TB port on the R6. The only sign of life I get when I plug in power is the power button flickers orange very briefly and only once.
I no longer see disk access in the security settings even though I've reinstalled the drivers and utility.