What browser are you using? For me firefox would run the game fine on one computer, but on another it would just give me a white screen, which doesn't quite sound like your issue, but perhaps. For me Chrome works best and is the recommended browser.
If you can't try a different browser you may have to clear cache and cookies from your browser, close it and reopen. That should fix it.
I hope you don't have to resort to throwing your computer away and buying a new one. 
