Does your keyboard work? Try running xsetup to configure your mouse settings for X. Or you could try a different X server.
I configured X for mouse control while booting and the result was my video display tanked. Without video I couldn't tell if the mouse was working or not so... Next I changed back to an old plug-in mouse, re-booted normally and it worked!
Now I have to figure out how to configure for a USB mouse.
original here.