What can i do when computer screen is black and with blinkinunderscore

When i was playing online games on computer, something fell off from the desk and landed on the socket. I went to pick up and accidently switch off the cpu , after that i switch it on again . The screen was black and with a blinking underscore on the screen. My computer is compaq fp7317 desktop, sorry for bad english i wrote but i really need help! Thank you
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More about what computer screen black blinkinunderscore

  1. Hello and welcome to Tom's Hardware Forums.

    If your PC came with an XP CD or a Recovery disk, use that to start the system then find the Command Prompt to run Checkdisk using the command syntax

    chkdsk c: /r

    including the spaces. That will start a five stage process which will examine your hard disk, including the Master Boot Record, and fix any disk errors caused by the unscheduled shutdown.

  2. Thank it works!thank you so much
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