my laptop stopped showing video, called dell a technician came and said we cant fix it, because i used other non dell screws, which he said i had inserted "construction screws" which was not true and he wont repair it, i took out battery yes, i put it back in yes i plugged in charger yes i updated and downgraded bios and i called dell support, and dont know what to do i have school next week and im very desperate for solutions, please help, my conclusion is backlight is lose but if so how can d+on have screen fully bright on? 
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