Check the cables connecting the monitor the keyboard
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[https://www.google.com/search?q=laptop+diagram+parts&safe=active&rlz=1C1CHZL_enUS698US728&espv=2&tbm=isch&imgil=0jRmpSTVkuoDrM%253A%253BXWZIp3pz4fmPSM%253Bhttp%25253A%25252F%25252Fwww.coolestcheaplaptops.com%25252FHow-A-Laptop-Works.html&source=iu&pf=m&fir=0jRmpSTVkuoDrM%253A%252CXWZIp3pz4fmPSM%252C_&usg=__XbnC7s1nsULnqgddhduZ7cWNj_8%3D&biw=1068&bih=455&dpr=1.25&ved=0ahUKEwiMxbr_0YnTAhVlilQKHdH3BiAQyjcIJw&ei=l_XiWMydHeWU0gLR75uAAg#imgrc=wyfoL5z5IeCXEM:|check the cables see if the harnesses fully locked and the cables insulation is not dry]