Dropped MacMini. Please HELP?

I dropped my mac mini 2010 on its top from 4ft off the concrete. It landed flat. I thought it was ok, however when I power it up the screen is white with a little shadded apple for 30 seconds and then powers down. I bought the device on craigslist so my options of getting it fixed in my price range are limited. Im going to attempt to tear down on my own before trashing it. Any ideas what to look for. I am not new to electronics. Im possitive I will not cause any additional damage. Unless of course I drop it again.