Might want to upgrade to bt4 since it is better etc.
Failing that make sure the md5 sum is correct.
If it is ok then you will probably need to try one of the other methods of booting, and/or configure the x-server. There are thousands of pages with info on how to do these things. Check the "stickies" in the newbie section, in addition to the tutorial section for bt3.
Also welcome to the forums.



