Can't go into setup screen, Raid 0,intel,ATI

[paddywide]

I already try 2 months, still can't go into Lion setup screen. I typed parameter -f -v. It halt in the middle and shows "USBMSC Identifier(non-unique)". Under Mac Lion install drive\System\Library\Extensions there are 204 .kext folder. Should I delete some of them?


Intel core i5 750, GigaByte P55A-UD3R, ATI 5450, 4GB DDR3, WD 1TB * 2 RAID 0.