[ubuntu] Grub Bootloader

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http://ubuntuforums.org – After I install Ubuntu 12.04 and reboot, the boot loader starts then a bunch of colors fill the screen like static. Then when i go to run windows booting from the hard drive with windows on it it tells me missing operating system. Note: Before selecting to install Ubuntu from the boot options screen on the disk i pressed f6 and selected nomodeset because if i did not select that the screen would just be a blinking cursor after pressing "Install Ubuntu". P.S Before putting in my GTX 570 I was able to install and run Ubuntu without any problems. Specs MoBO: MSIH61-E33M CPU: (Hardware)