Well you appear to still be running SP1 and the graphics and wifi are working (right?). To know what's wrong and how to fix it we really need to see what state the machine is in after you've updated to SP2. If the hardware works in SP1 it should work in SP2.

When you updated to SP2 what process did you use and were there any errors or problems during the process?

This thread makes reference to someone using the fglrx driver having an issue during upgrade to SP2, so worth having a look at that.