I desktop with pre-installed Win 7 I have install 12.04 along side Windows on different partitions of my disk with my usb pendrive.
Ubuntu installed successfully and working fine,and win 7 also working fine. but when i am booting the system where boot menu not appearing, automatically login to win 7.
when i am trying to boot with usb pen drive it showing boot menu (grub), in the boot menu if i am selecting Ubuntu it login to Ubuntu normally. without pendrive it is not login to ubuntu.
how to solve this problem. without reinstalling the os.
please help me for this