I am trying to help an elderly widow with her iMac (17-inch Late 2006) running OS 10.4.11. She is completely inept with anything technical so I can't ask her to troubleshoot without my being there.
Her problems started with a vertical line, similar to what is described in
this Fine Tuned Mac thread. I know that that's not related to OS 10.4 but I mention it because she asked for help originally due to that issue. I went to her house and quickly found that she had other problems. (She barely knew that anything was wrong!)
Clicking on almost anything results in a contextual menu, even though Control was not pressed. I disconnected the keyboard, connected the mouse directly to the computer and got the same result, so the keyboard is not the problem.
Double-clicking a desktop folder does not open the folder. Instead, you can only open it from the unbidden contextual menu. Clicking on items in the menu bar works normally. I accessed System Preferences from the Apple menu but clicking on any of the preference panes produced no results. Oddly, I accidentally clicked on the desktop and got the Desktop and Screensaver preference pane. I had wanted to create a new account to test for a corrupted preference file but it was not possible to get to any preference pane.
Switching from icon view to list view cannot be done; all I got was a contextual menu. In fact, clicking almost anywhere (desktop included) produces a CM.
Dock icons do not respond to a single click as they should. Instead, I get a contextual menu and can click Open to launch the application. Clicking a bookmark in Safari results in a contextual menu.
I wanted to back up her system with SuperDuper. I had previously downloaded it, put it in an external firewire drive and brought the drive to her. I was able, via the pesky CMs, to mount the .dmg file but clicking on any button to install produced nothing. This was consistent with other windows that had buttons. If the button was blue, clicking with the mouse did nothing but pressing Return worked.
I booted from the Disk Warrior 4.2 CD and rebuilt the directory. Mouse clicks behaved normally. The problem was not solved upon rebooting. Consequently, I decided to run A&I, which got her to the original OS, namely 10.4.7. The problems did not go away. I ran Software Update to get her to 10.4.11 and was unable to deselect an update to Front Row, so I opted to install both. This did not make the problem go away.
She does not have Stuffit installed (some readers may recall that this caused problems with CM items) and there is nothing in /Library/Contextual Menu Items.
Due to the problem with her display, she will either have to have that replaced or get a new computer. If she does, I'm afraid to have her use Migration Assistant because that may bring across whatever is causing her problem.
I tested SMART with Disk Utility and it was "verified".
Any suggestions?