Hello, I have owned this computer for over a year now, It has had the same problem since I first turned it on from purchasing at the local PC World.
Certain video games crash the entire system, I'm sure it's a GPU error as the screen turns completely into static, then I hear the audio slowly crash, then the whole thing stops working.
I have all updated drivers, defragged, checked system for errors.... problem still persists.
AMD Radeon R7 240
May I point out, this doesn't happen on all games. GTAV runs perfectly for hours on end, yet Call Of Duty WAW crashes ten minutes in.
Have you got another GPU you can try in the system? It may help us narrow down the cause of the fault.
Have you tried verifying the Call Of Duty files to ensure they are not corrupt?
Which other games are crashing?
What are your full system specs, os used and amd driver used?