Ok so I bought a 20gb HD for the elites and pros to put in my slim today and when I put it in and start up the console
it beeps and doesnt go past the first Xbox 360 screen. When I take it out however it works just fine. Has anyone else had this
problem?

I've put old 360 HDDs in three different 360S consoles and have never seen that. Is there any way you can verify that the HDD works in another Xbox 360?

http://www.youtube.com/watch?v=l0NhKgRC2tg