Turn off the unit.
Hold the function button for 10 seconds while the unit is still off.
While still holding the function flip the power switch to on.
Once the function light starts to blink then release function button and press it again for one second.
If this fails to make it boot and it continues to just have a flashing power light then you will have to follow FAQ 3 of 5 that is pinned at the top of the storage forum.