Fedora 12 freezes

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http://forums.fedoraforum.org – Hello! I've installed Fedora 12 on my old box (motherboard Gigabyte GA-965P-DS3). Everything worked perfect. Then I've upgraded my box with new motherboard - Gigabyte GA-EP43T-UD3L. After this upgrade my box started freezing after some time (any input doesn't work, network services do not respond) only system reset helps until the next freeze. I don't have problems in windows xp - 3 days of uptime and everything is ok. How I can fix that in Fedora 12? Is there any way to make it work? Is there a way to see why it freezes? (HowTos)