Screen corrupted on 10.6.8-no problems on 10.6.7-ssh still possible

Looks like I'm stuck on 10.6.7 on my desktop iMac for now. (My other iMac, Macbook Pro, and two Mac minis updated just fine.)
Here's what I've tried so far:
1. Upgraded to 10.6.8 via MacOSX10.6.8Upd.dmg:
After 2nd reboot, gray screen+ logo, then black screen.
Can SSH in and "sw_vers" shows 10.6.8 installed.
Display unusable.
2. Reset PRAM, reboot. Gray screen+ logo, then black screen. Display unusable.
3. Re-installed MacOSX10.6.8Upd.dmg over ssh connection using "hdiutil", "installer", and "shutdown -r".
After 2nd reboot, gray screen+ logo, then black screen.
Can SSH in and "sw_vers" shows 10.6.8 installed.
Display unusable.
4. Restored 10.6.7 from Time Machine. Display fine.
5. Upgraded to 10.6.8 via Software Update:
After 2nd reboot, gray screen+ logo, then black screen.
Can SSH in and "sw_vers" shows 10.6.8 installed.
Display unusable.
6. Reset PRAM, reboot. Gray screen+ logo, then black screen. Display unusable.
7. Restored 10.6.7 from Time Machine. Display fine.
8. Removed extraneous software and startup daemons (Dropbox, Remotetap, MagicPrefs, MacFUSE, SpiderOak, JungleDisk, Firewave, iStat, Parallels Desktop, Growl, Steam, World of Warcraft).
9. Upgraded via MacOSX10.6.8Upd.dmg:
After 2nd reboot, gray screen+ logo, then random red & green pixels.
Can SSH in and "sw_vers" shows 10.6.8 installed.
Display unusable.
10. Re-installed 10.6 Snow Leopard from DVD (no disk erasure). Display fine.
11. Upgraded to 10.6.8 via Software Update:
After 2nd reboot, gray screen+ logo, then random red & green pixels.
Display unusable.
12. Re-installed 10.6 Snow Leopard from DVD, this time erasing disk. Restored no files or apps, created single user account. Display fine.
13. Upgraded to 10.6.8 via Software Update:
After 2nd reboot, gray screen+ logo, then random green blocks and other pixels.
Display unusable.
14. Reset PRAM, reboot. Gray screen+ logo, random green blocks and other pixels. Display unusable.
I'm guessing that an updated graphics driver in 10.6.8 doesn't like the display hardware in my iMac. But it does work fine with 10.6.7! This is an iMac8,1, Intel Core 2 Duo 3.06 GHz, NVIDIA GeForce 8800 GS, built-in display.
Any ideas what I should try next? Or should I merely accept that Snow Leopard is the last cat that'll run on this iMac?
Message was edited to replace HTML entities with actual em-dashes (thanks broken Apple forum)

I've got my Mac back!
Even though the Finder wasn't running, because I had populated my Dock with dozens of applications, I was able to launch the Terminal app and open a window. From there I was eventually able to launch the Installer, point it at the 10.6.8 Combo Update (for some reason, fortunately, I had downloaded it rather than letting Software Update do it), and wait at least 30 minutes when the installer claimed that there was less than 1 minute left to complete the install. After it was done and I restarted the Mac, it no longer insisted that I needed to send/ignore thousands of "Finder quit unexpectedly." messages and the Finder was running.
BTW, towards the end of the installation (or re-installation), the Finder began to function (my desktop icons appeared and I could open folders) and now the only remaining issue is the Menu Bar won't appear unless I click the Finder in the Dock.
Thanks to those who helped me by providing the instructions needed to use the Terminal window correctly.

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Link to picture
Moderator note; embedded picture >50K converted to link

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