I have a flashing light on my apple tv , only thing on the screen is a blue music symbol and some sort of USB cord.

I have a flashing light on my apple tv. When I replug in the power a blue music symbol and some USB cord shows up.

Sounds like the Apple TV is in recovery mode. Try to restore the Apple TV. Follow the appropriate link for your Apple TV for instructions on the restore process.
1st Gen - http://support.apple.com/kb/HT3199
2nd & 3rd Gen - http://support.apple.com/kb/HT4367

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