hi docshadow

after the crash i try fix the extensions.kext but no go.
so reinstall snow leopard 15mins up and runnibg now..

my graphic card is 8800GTS640MB not 512
also i did extect what you said but the video still boot at 1024x768.
anything else that can try..

thanks dude

a pics of my com.apple.boot.plist

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Asus Rampage Extreme x48 / intel Q9450/ OC 4.0Ghz 4core
Corsair GT /6GB/DDR3 1603mhz/
Mac Radeon ATI HD-5770/1GB/
Lion 10.7.3 120GB SSD/ Mountain Lion 10.8 250GB SSD
Logitech HD-c905 webcam
Apple keyboard bluetooth+mouse bluetooth
Acer 24" HD Screen/ Fillwater cooling system