Hi all... I having Dell Inspiron N5010.... Couple of days back I wanted to move from Windows to Ubuntu ... So I boot using the pendrive and removed the windows operating system ...now when I restarted the system,  I'm not able to access the boot menu (tried with both Ubuntu and windows OS pendrive ). Whenever I restart the system, it will be stuck at the logo screen... When I press F2 or F12, respective option will be highlighted but nothing will be shown... It will be stuck at logo screen only.... I even tried letting battery drain think low battery alert will give an option to enter into BIOS but low battery alert is also not shown.... Now I have system without any operating system and not able to enter into the boot menu..... Is there any solution that can get me out of this situation..... Thanks in advance