Does not power up.

HELLO THERE:
Normally on these devices there is asystem reset that can be accomplished by pressing and holding in the reset button for 4 minutes and if this is a newer device than they have a internal reset feature that requires you to press in the reset for 3 minutes and than leaving the device unplugged over night or 4 to 6 hours and if this still does not work there is a small fuse that is on the main board that will fail and needs to be relpaced
If you feel confident about opening the unit up, radio shack sells the fuse that will fit this device.
But if the unit is still under warranty i would use the warranty and have the unit serviced and they will also provide you with any updates that are available if any ok?
I hope that this has been very helpful for you
Best regards michael