White screen

I have a problem when I load the unity that already shows a white screen and nothing happens. Can anyone help me?

number of things;
-your browser, clear cache, or try a new browser.
-your hardware, your pc may not be able to load the game
-update your gpu drivers.
-update unity, or reinstall unity.
hope this helped.

Thanks for help

[editline]5th October 2013[/editline]

I did everything you wrote, but it did not help. I have no idea what could be wrong on Thursday to function normally ;/