Hi everyone, please help me with this mind bageling problem, I have alienware 18 with SLI gtx780, windows 8. the issue started when I used external screen to play games using HDMI port. when I re-installed windows because I had performance issues I used the external screen. and now my laptop screen doesn't work when I turn on my laptop. when I turn it on it beeps 8 times and the screen won't work. but when I plug a secondary screen it works fine. now the laptop screen is configured as secondary and the secondary screen is configured as primary. so the laptop screen works only when I set it as 1st screen using the external screen. changing the priority to laptop screen in invida settings doesn't work. I tried formatting and reinstalling windows multiple times but it doesn't work. I tried set bios to defaulter but it didn't work. please help me with this problem. even Dell service client in my country couldn't solve it.