[kaustav_geek]

Yes, its a graphic problem. As mentioned before, your hdd was running hot. So, that might also be a problem....

Is everything fine now ? If not, do you still get the same type of errors ? BSODs are common in case of Pirated Windows. If your copy of windows is Pirated, then these BSODs will appear...

In case its genuine, there might be some driver conflict with your Graphics driver... Try uninstalling your Drivers and DirectX and then reinstall...

Has this problem been there since the first Day ?? In case it is, then your Mobo is faulty... or your CPU installation isn't just correct....leading to overheating...

And, how did your Technician check your RAM ?? I asked you to check it yourself. Install Memtest86 and test your RAM modules.. Also, monitor the temperature of your system under load... both CPU&HDD....