L502x Freezing During Game Play

My Dell XPS 15 L502x keeps freezing and locking up when I try to play games such as World of Warcraft, Everquest 2 and Allods Online. The system becomes unresponsive and a loud obnoxious buzzing sound comes out of the speakers. If on the very rare occasion I manage to get to the task manager, I end the game process but it doesn't actually end. I am forced to do a hard reboot by holding down the power button to switch if off and then back on again.

I have done the hardware diagnostic checks and nothing seems to come up, I have done a clean install of windows twice, I have tried different drivers for graphics and audio, installing drivers from the manufacturers website and also the drivers that came on the Dell Drivers Disc and it is still freezing during game play. I paid a lot of money for this laptop and paid out extra for the extended warranty, I just want a laptop that can run games. Which is what I paid for. I have contacted support who tried to tell me it was software issues and wanted me to pay to get help with the solution station.

I have read many forum posts where people have the exact same issue and they say that Dell are terrible at providing basic support.

Please help me fix my laptop Dell.