2000 BMW740il

Navigation stopped working then now the radio/caset/cd stopped working to, I basically can't switch from one thing to the other I can't
get into any of the settings that u control thru the keys that gets u to computer (e.g. to change speakers settings, set the speed alarm). I am thinking to search for the unit that needs to change on the net and buy it and get it install at a mechanic I know. Does any one know what is the part I should be looking for? Is it the whole navigation system, I found one in the net that includes the screen, the cd changer and the dvd holder in the trunk. Please help.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.