black screen after kernel update

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http://forums.fedoraforum.org – recently I have downloaded updates for my fedora 18 x86_64 installation and one of them was a kernel update. if I try to boot new kernel from grub menu it stalls at a black screen and I have to hard reset. If I choose the older kernel boots fine. I think it is issue with proprietary drivers for nvidia but thats just speculation. I am very new to linux architecture and any help would be appreciated. thank you btw I have tried booting with no modset but no luck (HowTos)