Dell — i can not adjust the screen contrast and the buttons given do not work, except for the + , - for brightness control

Address:

Udhampur, Jammu and Kashmir

i can not adjust the screen contrast and the buttons given do not work, except for the +, - for brightness control good afternoon the mouse battery clip is also is snapped. the present problem is the other buttons like menu button, back button, menu adjustment like contrast, etc could not be controlled. as the buttons are disabled. being such a reputed and international brand, how could this have happened? like non functional buttons, no brightness control within pc settings. pl tell me how do i adjust the contrast, of the screen. i have other AIOs with me, no such problem was ever seen in that. am sure this is a flaw with the AIO. pl help me on this. thanks