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Lost video after yum update and reboot on F16 and F17

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http://forums.fedoraforum.org – After install of F16 all was well but ran a yum update and rebooted to the newer (3.4.xxx x86_64) kernel and screen goes blank after grub menu. Could choose the original F16 (3.1.xxx_x86_64) kernel at grub and it would boot fine. I decided to give F17 a try... After a clean F17 installation all is working fine... Then run yum update and reboot into latest kernel... and screen goes blank again. Can reboot into older kernel and all works fine again. Any ideas on what is causing this? I have found other folks with same issues as far back as F12 but no solutions? I can post urls late (HowTos)