[ubuntu] Too much ram cuases Grub to freeze!

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http://ubuntuforums.org – i have 3 gigs of ram with a 32 bit Os. when i normally try to boot it freezes at "GRUB Loading." when i run a option called OS install from my bios it boots up fine. OS install restricts the ram to 265 mbs. whats wrong with it?!? should i reset my cmos? (Hardware)