Laptop Startup Problems

Hello,
Just last night my computer was working fine. I did not download any mp3 files, or any other files of any sort. When i woke up this morning and turned it on, it would not even get to the screen where i enter in the password to unlock the laptop. I tried using a recovery and system disc with it already in a helpless effort. Now when i turn it on the screen is black with a grey blinking line at the top left. Help me please