That shouldn't be a problem. I connect my Macs with ease to my BV8.
Here's what you should do. Get a DVI-to-HDMI converter cable. (DVI is the video protocol of HDMI, and is the same plug that is in your Mac to drive an external screen.)
The HDMI connector goes into the BV.
Then in setup you need to assign the source properly. If you're using a Beo4, then just add PC to LIST; and in the setup menu on the BeoVision, you tell the television that PC means the HDMI input.