Just thought I'd share what happened to me the other day......
Came back from NAMM to find my D Command exhibiting this LED blinking thing..... contacted Avid, tech instantly knew what the issue was. Bad LED power supply. They overnighted a new PSU for $268 including shipping-not too bad considering how specialized this part is and especially compared to Apogee that wants $530 (+$110 for expedited service) to fix my Symphony I/O!!!
Really great customer service experience for sure!!!