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With the phone off, hold * and # keys and then press power button:- If your phone screen still don't show anything then the backlight or whole screen is broken and you would need to replace or make a technician to replace the screen.- If your phone shows a boot screen with serial numbers on it, then you would need to re-flash or reload the phone firmware to recover your phone. For that you may need some special software, a PC and your phone's USB cable. You can find tutorials and guides over the web.To get out the bootloader screen you need to take out the battery and the re-flash procedure delete all your data so I recommend you to download it with your phones PC software.Good Luck...