So my Alienware m17x r3 suddenly shut down mid use where the screen white with lots of thin grey horizontal lines. On boot the keyboard lights up but the screen stays black and there's 4 beeps.

I did look this up online and read that it might be something to do with the RAM so I took it to both my university IT centre and a compluter repair shop which both tried switching the RAM around as suggested on the internet as well as trying with new RAM with no success.

Is the problem deffinately the motherboard? Because it is unlikely surely that both the RAM connectors have stoped working?

The laptop is now around, probably over, 2 years old and out of warranty.

What should I do now? What is the whole process of sending it in and what are the likely costs?