Black rectangle top right

A semi-transparent black rectangle has appeared top right, just below the menu bar, about 3 inches by 1.5 inches. I cannot drag or resize it but can click throught it to items underneath.I think it appeared as I was upgrading Stuffit Expander to 10.0.2. I have voice-over turned off. A restart has not cured it. Any ideas?

Hi, Richard.
Since you've indicated that VoiceOver is off:
1. If you see a single black rectangle that follows the mouse around, you have enabled the Preview Rectangle for Zoom. The Preview Rectangle appears if you have the following System Preferences > Universal Access > Seeing preferences set:• Zoom On and...
• ...in the Zoom "Options" sheet:• "Show preview rectangle when zoomed out..." selected; and
• have set Maximum Zoom anywhere above the minimum setting, i.e. >1.
If Zoom is not required and On is selected, select Off.
2. Have you used a third-party utility that enables the hidden "Minimize desktop to a box" feature of Exposé? In prior versions of Mac OS X, enabling this hidden (and not ready for prime time) feature could create dead spotson the screen in the region of said "box."
3. An errant Startup or Login Item maybe the cause. My "Troubleshooting Startup and Login Items" FAQ can help you pin that down if such an item is causing the problem.
4. I also suggest following these general iMac G5 troubleshooting steps:1. See if your computer's serial number is in the range specified in the "iMac G5 Repair Extension Program for Video and Power Issues" document.
2. Rule out potential hardware problems. Run the Apple Hardware Test that came with the computer. Instructions for doing so will be found in the hardcopy manual that accompanied your computer. For additional details, see my "Apple Hardware Test" FAQ.
3. Check the diagnostic LEDs, a feature of your iMac G5. See "About the iMac G5 diagnostic LEDs."
4. If your iMac G5 will not turn on, see "iMac G5: Troubleshooting when your computer won't turn on."
5. See also the iMac Service & Support site.
6. Check the iMac G5 Discussions for similar reports from other users.
7. As a general check, run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
8. If the computer is either under warranty or covered by an AppleCare Protection Plan, don't hesitate to take advantage of your warranty and contact AppleCare.Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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