Desktop won't display correctly after an attempt to fix HDMI audio

Question

I was trying to fix the audio so that it would forward for HDMI output. I tried this:

http://wiki.cchtml.com/index.php/Ubuntu_Quantal_Installation_Guide#Installing_Catalyst_Manually_.28from_AMD.2FATI.27s_site.29_BETA.2FEXPERIMENTAL

to install the catalyst and .deb stuff. And then I restarted my computer. Before I even got a chance to see if my audio problem was fixed the the display went all weird. The display doesn't show me anything besides a blank background. I saw this recent question: I can see a background, nothing more? and wasn't able to see anything under the list of drivers. I ran

sudo lshw -C display.

Here is the output:

*-display UNCLAIMED
     description: VGA compatible controller
     product: RS880M [Mobility Radeon HD 4200 Series]
     vendor: Advanced Micro Devices [AMD] nee ATI
     physical id: 5
     bus info: pci@0000:01:05.0
     version: 00
     width: 32 bits
     clock: 33MHz
     capabilities: pm msi vga_controller bus_master cap_list
     configuration: latency=0
     resources: memory:e0000000-efffffff ioport:3000(size=256) memory:f0300000-f030ffff memory:f0200000-f02fffff

Any ideas on how to fix this problem? Whatever I did has gimped me pretty bad.