Hi guys.

I installed Ubuntu 12.04 recently in my friend's notebook (dual-boot with Windows 7. And I didn't use wubi) and everything went smoothly. However, when we turn on the laptop, it boots directly to Windows 7. When I try to boot via the pendrive to reinstall or something else, the grub pops up. And last I checked, I didn't find any partition in the laptop with the MBR or grub. But every pendrive with ubuntu prompts the grub screen, not the installation one anymore. How do I make the grub show up without a pendrive? Thanks in advance!