Blue Screen, Missing Dock and Mac HD problems

There seem to be at least three problems with my iMAC:
1) the screen is blue even though under System Preferences, it is set for an image,
2) the Dock is missing even though under Dock Settings, it should not be hidden and should be at the bottom (oddly when I select "right" location for the dock, the radio button does not light up, but is changed if I close and reopen the preferences screen), and
3) clicking on the Macintosh HD does not open it or the other files (e.g., PDF, *.doc) on the Desktop.
The only recent change I made to the system was to add Clamxav for virus scans, but that was scheduled to run on Monday. I have been traveling and my spouse is not sure when the issues started.
I have tried the PRAM re-set explained elsewhere, but that did not help. Any other possible solutions?

Welcome to Discussions - my first response would be to reset the PRAM, even though yu have already done it Try doing it again and if that doesn't help, check your disk using Disk Utility:
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
Please post back with results, it could be a combination of problems, or it coul be corrupted preferences, try running Preferential Treatment to see if that's the case.

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Message Edited by retro74 on 07-05-2008 08:50 AM
Solved!
Go to Solution.

Unfortunately I could not fix the problem so I wiped my system and loaded all new drivers before I found this posting.
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Download at www.memtestosx.org
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How is mail different than that?
Mail keeps mailboxes in their own separate Finder files.
Home -> Library -> Mail
Home -> Library -> Mail Downloads
Notice also that Mailboxes themselves have their own folders in
Home -> Library -> Mail -> Mailboxes
Addressbook keeps addresses for Mail in its own set of Finder Files.
Home -> Library -> Application Support -> Addressbook
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Hi, j. Welcome to the Discussions.
A blue screen at startup generally indicates a damaged or incompatible Startup or Login Item. However, the hard restart you describe may have caused other issues.
1. I suggest you begin troubleshooting using the process specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
2. If that does not resolve the issue, see my "Troubleshooting Startup and Login Items" FAQ for steps that might help you with this problem.
3. If Finder continues to be problematic after the above, See my "Finder Issues? How to delete its preferences" FAQ.
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.

Blue Screen, Missing Dock and Mac HD problems

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