Apple TV 2G plug power supply but no led signal?

MY Apple TV 2G maybe is  broken.
This is the situation.
When only Plug-in Micro-USB then LED's signal is flash quickly.
When only Plug-in Power Supply then LED's signal is nothing.
And i have done everything i can do . Recover, Recover and Recover.....
What,s next i can do ?  i want to solve my Apple TV 2G!
Thank You~

Thanks bobbyco57's answer
But, when i plug-in HDMI & Power Supply then LED's signal is still no reaction.
I don't know what happen and how to solve it .

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