Hi All,
My Amplifi 150 died yesterday...same symptoms as described above (powers on, all lights on but dim, etc.)
I followed the instructions to remove the SD card, restart, add the SD card back and restart....and it WORKED!
Thank you to all who contributed to this solution!
Here is a forum thread with pics and instructions for the SD card:
And condolences to those whom it did not work for. :.(