Apple tv does not boot

My 2nd gen apple tv MC572LL/A 2010 (5 months old)  has been acting erratic and now won't load at all.   It just has the fast blinking light with no signal to tv.   Out of the box and first few months it worked perfectly, however the last few times I had to unplug to reboot, but it eventually loaded.  Now nothing at all.  Reset attempts also not successful of router and unit.  Anything else I can try to reset or reboot?  Service?

From the Apple TV 2 manual:
- Disconnect the power and HDMI cables from Apple TV.
- Connect one end of a micro USB cable (sold separately) to the back of
Apple TV, and the other end to your computer.
- Open iTunes on your computer, select Apple TV in the Source list, and then
click Restore

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