I have finally solved this problem.
First I accessed my machine with a Fedora 9 live usb.
I noticed that kernel installed in my upgraded Fedora 10 machine was still that of fedora 9. I have no idea why.
Quote:
vmlinuz-2.6.27.23-78.2.50.fc9.i686
initrd-2.6.27.23-78.2.50.fc9.i686.img
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I downloaded Fedora 10 kerenel : kernel-2.6.27.5-117.fc10.i686.rpm and tried to install it with rpm.
But it gave an error that a new and latest kernel in already installed.
I used --oldpackage option with rpm and forced install it.
Then I used mkinitrd -v to create initial ramdisk image.
Rest was a simple change in Grub configuration to use the new vmlinuz-2.6.27.5-117.fc10.i686 to boot.