Can you boot in safe mode (-x at boot prompt)?
Restoring *all* extensions after an OS update is probably not a good idea. That being said, if you can boot in safe mode you should be able to reinstall your video driver so the display works right again, or at least beat around at your kexts until you get it working.

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Custom Hackintosh...AMD Athlon X2 5000+ (2.6 GHz) on GA-MA78GM-S2H...Linksys WMP300n Wireless...ALC889a sound...ATI HD 3650 PCIe...1 GB DDR2 RAM...320GB Western Digital SATA + 200GB Seagate IDE HDD...Rosewill DVD-RW IDE...Running Kalyway upgraded to 10.5.7...All Fully Functional