If there are no beep codes, then the system is probably starting up fine. The display just isn't getting through. Try shining a bright light on your screen when you turn it on. It is possible that the LED backlight on your screen died. The entire LCD panel could be broken as well or possibly (and in this case you may very well be boned) your graphics card may have given up the goose. Is it still under warranty? If so, that's your best bet right there. If not, you can attempt a DIY repair or take it to a local computer repair service. Keep in mind that you may be better off buying a new laptop, depending on the cost of repairs.