what buttons can i push to get my computer screen on

[Leonardo_9]

hi my laptop is black with arrow what buttons should i push to get it working again thnk you.i cant see the blue screen or download a program without it working thnk you.

 

[Colif]

this might help: http://answers.microsoft.com/en-us/windows/forum/all/win7-wont-boot-black-screen-with-blinking-cursor/1b4b501a-6722-446c-8275-c1c568f275b4