Daughter has a Dell Studio 1737 Laptop, which allegedly overheated and cut out. Restarted fine, apart from unable to connect to the internet. When trying to reconnect it to the internet, it wouldn't load, and had to close it down. Then when attempted to restart again, and every time since, it allows me to put the password in, and then the screen will be black with only the mouse, that you can move. No matter how long we leave it on or off it still does the same. Advice?