Pine64 not powering up.

[skylab]

Hello everyone, I have a Pine64-db rev b i bought a while ago, i've never used it and it was sitting in the static bag , i now decide to use it with
octoprint for my 3d printer and i applied power and while the monitor get drive for a few seconds, it reverts to no signal present , only the power 
led is illuminate , the usb keyboard led flashes when power is applied but thats it..it sits there dead..nothing , can anyone help me how to proceed
from here.