Lenovo g 500 black screen with a blinking cursor?

I have a problem with lenovo g 500… When i boot the window it is stable with a black screen with a blinking cursor i reinstall the window but it is not work and what is the problem please solve it and reply fast… Thanks in advance

Hard disk problem.

Install another hdd

Have you made is hardware changes to your computer i.e. Added more ram? Did you made an upgrade install of windows or is it a clean install? Most probably you made an upgrade install. While the computer is booting press F8 repeatedly till your a list of options choose "Start windows using Last Known Good Configurations" this might solve your issue, other wise you have to make a clean windows install, if this didn't work it might be a hardware\driver issue.

Your hdd may have bad sector. Try to install another hdd