During boot, Fedora freezed but display 100% progress complete

[aminulsumon]

i am super nobie in Fedora as well as Linux
after long hour update(#yum updade) now the situation is in boot menu i have 3 item.
1. Fedora(2.6.27.21-170.2.56.fc10.i686)
2. Fedora(2.6.27.5-117.fc10.i686)
3. other
other indicate here windows.
for select 1 or 2 it goes to fedora and loading 100% (a black screen with white progress bar at bottom) and freeze. (
i don't know why it happened and how to solve.

any help highly appreciated
Sumon