One option to fix a cell phone with a blank screen is a hard reset. On an Android phone, turn the device off and then push the home button, volume up button and power button simultaneously.
If a hard reset is an option, a menu pops up on the screen, allowing the user to conduct a factory reset. A factory reset is permanent and impossible to undo. However, it often fixes software issues that cause a blank screen. It restores the phone software to its out-of-the-box condition, but it does not affect the data stored on the SIM card or the memory card. If pressing this series of buttons does not bring up the reset menu screen on the cell phone, professional service is necessary.