How to check power? Device looks dead

Hi,
I didnt use the board for over a year now and I need it again. I got a new 5V 4A PSU. This one is working fine (i measured and tested it).
I did setup the micro sd correctly. When I connect the power cord to the parallella board, no led or anything is going on!
Is there an easy way to debug this?
I didnt use the board for over a year now and I need it again. I got a new 5V 4A PSU. This one is working fine (i measured and tested it).
I did setup the micro sd correctly. When I connect the power cord to the parallella board, no led or anything is going on!
Is there an easy way to debug this?