Browsing Youtube and Macbook Pro (2009) froze--rebooting just leads to apple logo against grey screen and loading circle

I was browsing Youtube when the entire Macbook Pro (2009) froze up. After a couple of minutes, I forced a shut down and now when I try starting it back up it just displays the apple logo against the grey backdrop with the loading circle just going around and around.
I have no idea what's going on with it. I tried disconnecting it from the power cord--letting it cool down, took the battery out, etc...

That's called a Gray Screen issue and it could be caused by multiple factors.
You can run through the Steps here to narrow it down
https://discussions.apple.com/docs/DOC-3353

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