system reboot always after upgrade kernel

[Linux]

Hi:
  I use the Fedora 2 on my Intel P4 2.0G, lastday I upgraded my kernel to 2.6.8.624.
But now when boot it reports /sbin/udevstart exit abnormally. and start login.
After logged in less than 1 minute, the system reboot again. And I upgrade the udev to
0.39 within 1 minute, there is no change. what happens that? how Can I recover my system?


thanks a lot for your  help.


Sun Zongjun
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