Alienware 17 LA-9331p black screen

[Razor0601]

Today I got an AW17 R1 Ranger with 120Hz 3D Panel, I7-4800mq, 32GB RAM and a 780m. When I turn it on the screen stays black but with no beep code. When I plug in HDMI the Display stays black and I get 8 beeps. Also I tried with an M17X R3 60Hz 1600x900 LCD, also 8 beeps. The same thing is with a GTX 770m, 860m and MSI 780m. After that I did a Power drain and it gave me first 5 beeps and after that the same 8 beeps.
Anyone who has an idea what that could be?
If it is a Motherboard issue, which component is affected?

[ktmmotocross]

Re: Alienware 17 LA-9331p black screen

did u put connector to right slot? there are two slots for video

[SMDFlea]

Re: Alienware 17 LA-9331p black screen

i suspect the lvds cables will be a different part number too.The first thing to try is a new cable.If theres still nothing then it could be the EDID thats corrupt

[Razor0601]

Re: Alienware 17 LA-9331p black screen

Yes, the M17X R3 is only LVDS. That is the slot with no holes.
So I have to try a new EDP Cable?
And where to find the EDID?

[Razor0601]

Re: Alienware 17 LA-9331p black screen

Ok, I found the fault. It was the EDP-Cable on the back of the LCD itself, which was loosen.
Never thought that it could be so easy.