Hi and thanks for all the feedback! Hardware failure; well that is disappointing!
However, I installed the driver update: "ATI/AMD proprietary FGLRX graphics driver", and it's corrected the following:
*The static lines that appear at the login screen are gone.
*I was able to successfully upload that picture I mentioned earlier following the EXACT same steps as before and it worked this time.
*I tried my Ubuntu 10.04 CD and it also worked fine this time.
Unfortunately, I tried the Ubuntu 10.10 CD and I was able to get further in it this time; I was able to click "Try It", but that's when it reset again (before I could only get to the first purple screen). I tried it a second time and didn't even get that far (first purple screen again).
Trying to use HandBrake also still caused it to restart.
But now it DOES NOT show that freeze-frame-screen-shot of my desktop at the moment it crashed, like it always did before.
Now there is also another driver update: "ATI/AMD proprietary FGLRX graphics driver (post release updates)" but when I try to install that, I get this error:
Sorry, installation of this driver failed.
Please have a look at the log file for details: /var/log/jockey.log
After that fails, I have to download and install the original "ATI/AMD proprietary FGLRX graphics driver" again.
I tried installing the first one, rebooting, and then installing the post release updates. When that didn't work, I tried to install both one after the other without restarting in-between. I always got the same results (attached is jockey.log).
Concerning trying to make Leafpad work again, I tried "Mark for Reinstallation"; didn't work. I completely uninstalled it, rebooted, installed it, rebooted and it still didn't work. I typed "leafpad" in the terminal and got this:
I tried "sudo leafpad" and it actually worked. I looked up "Segmentation fault" but I only have a vague understanding of what it is now (I assume this is a memory problem since it broke after a reboot while it was running, twice in a row). But I'm out of ideas to try to fix this now.
Segmentation fault (core dumped)
So, now my questions are:
Based on what happened after the driver update, does the somewhat-random rebooting still appear to be a hardware issue?
Since I'm still able to recreate the crash/restart, is there any other log I can check that might point to something more specific that I could troubleshoot? Or, is there anything else I can look into to possibly help help verify it is really is hardware failure?
How else could I go about trying to install the "post release updates" driver update?
I have no idea what to even try to do to fix Leafpad now. Any suggestions to fix Leafpad error: Segmentation fault (core dumped)?
And should I make a new thread for any of these questions, or is this all ok here?
Also, thanks again for the help!