gnome3 was broken down in fedora 16

edit

I install fedora 16(x86_64) with DVD iso file.

It'was work well, but sometimes Crash.

Yesterday, my fedora was crashed, then I turn off my computer by power button.

But today, I turn on my computer, my computer started with feedback mode.

I try to repair it by run

yum reinstall "gnome*"

but it dosen't works. My video card is Nvidia GT 240

I'm very sorry for my bad english.

Thanks