Desktop Display distorted ... cannot see GUI to reset ... login window FINE

Please help ... Somehow (I did it but don't know how) the Display settings on my Tiger Mac have gotten to some setting that distorts the image beyond visual comprehension (diagonal scanline-like distortion). The login window is just fine, but when the desktop launches it goes batty.
I've zapped the PRAM to no avail.
I'm totally stuck.

First do this...
"Try 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."
http://docs.info.apple.com/article.html?artnum=106214
Next do this...
Archive and Install feature...
http://docs.info.apple.com/article.html?artnum=107120
Then after booting up, repair Permissions, then reapply the combo update...
The combo update for PowerPC-based Macs...
http://www.apple.com/support/downloads/macosx10411comboupdateppc.html
The combo update for Intel-based Macs...
http://www.apple.com/support/downloads/macosx10411comboupdateintel.html
Repair Permissions afterwards, reboot.

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