I had this happen to me, your firmware is corrupted and recovery is not possible.
(Because you will not be able to get the Recovery MENU to boot.)
Send the box to DLink.(save time)
This will happen if power is interrupted to the box, usually during a firmware update.
(Automatic or otherwise)
Its a sad day in boxee land. :^(
Try this anyways, You should press and hold the button on the box for 8 seconds exactly.
Under 6 is too little and over 10 is to long.
PC - (2x) 6-Core 2439 Opterons, 32GB Ram, SLI GTX670, (2x) 240GB SSD in Raid '0', Seasonic x1250 PSU.
Boxeebox firmware 184.108.40.20634
4TB NAS, 1TB WD Passport on box w/32GB SDCard in box.