Currently, my PC works fine with hard drive #1 (320GB).
Later, I then installed another hard drive, #2 (500GB).
Both hard drives have almost the exact image on them, Ubuntu 12.04. I configured the PC to boot from hard drive #1. It recognizes hard drive #2 as a third master drive.
When I boot, and AFTER logging in, the workspace is displayed as "squiggly"; that's a technical term. This would look like your analog TV screen displaying an untuned signal, remember what that looks like?
I don't see this problem when either hard drive is the only hard drive connected. I don't see issues with my graphics card. Why do they not work well together?