[ubuntu] cant boot to Ubuntu but windows runs perfectly

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http://ubuntuforums.org – I installed Ubuntu 10.04 beside Windows 7 (not wubi). It seemed to work well except for a monitor problem which I think I had worked out. I then upgraded to Ubuntu 11... it seemed to go ok. I upgraded to Ubuntu 12. After that, I could not boot either Ubuntu 12 or Windows7 I installed boot-restore (I think that is the name of it) using LiveCD. the computer will now boot straight to Windows7 ONLY! I used liveCD and ran "fdisk-l" and it shows if have 3 "fat", 2 ubuntu and one other partition. I looked at the harddrive using the Windows 7 program and it ONLY shows the (Hardware)