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HP Recommended
HP Z420
Microsoft Windows 7 (64-bit)

THE POINTER OF MOUSE  AFTER 10 [s]  MOVES IN ANOTHER WINDOW OR STOPPED IT DURING THE WRITNG AND THE PROBLEM IS I LOST CHARACTER DURING THE WRITING. IT IS A PROBLEM FOR DIGIT THE PASSWORD OR DOCUMENT. 

I clear the register, I change the mouse and the keyboard but nothing to do. 

During the start up I feel 4 short beep but I don't know what to do. 

Thanks for help

 

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