You have a'''kernel panic''' ''they can be either hardware or software related. ''If you added a new component disconnect it before rebooting.
Restart your '''Mac with a [http://support.apple.com/kb/ht1455|Safe Boot]''' and see if the kernel panic happens again.
[http://support.apple.com/kb/TS3742?viewlocale=en_US&locale=en_US|This] is Apples advice about solving Kernel Panics.
[http://thexlab.com/faqs/kernelpanics.html|Here] is a good place for DIY troubleshooting of Kernel Panics.
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