[ubuntu] ubuntu boots from usb but not my hard drive? o.0

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http://ubuntuforums.org – hey guys, this issue has been driving me crazy for the past 4 days and i cant figure out what to do. i have an i7 2600k, asus p8z68 v-pro/gen3 board, and an nvidia gtx570 in my computer and for like 4 months i couldn't get ubuntu to boot at all until i found out i had to switch to internal graphics and not my 570 so since i passed that hump and got ubuntu to boot from a usb i now can't boot it from a hard drive after a full install. i have a 1tb hard drive with windows and a seperate 120gb i want ubuntu on so i boot from the usb perfectly fine, no problem. then i install ubuntu on the 120gb us (Hardware)