My mac book wont boot up. just grey screen

I had my computer plugged into my HDTV. My battery died and I unplugged the HD cord and plugged my battery charger in. I tried to boot up but all I get is a Frey screen. No apple logo. No chime.  I've tried all the suggestions on the apple site for a when you get a grey screen
Its a Mac book pro from 2010

I mean grey screen.

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