Sometimes when I start up a game and the loading screens are seen the sound in my headphones goes away and the screen becomes frozen on the previous image. The monitor then goes black but my computer is still powered up. I have to manually turn off my computer and turn it back on to get it back up. The type of hardware I have are: CPU: AMD Phenom X4 965 Black Edition. GPU: R9 380x. Motherboard: Asus Crosshair IV motherboard. The older parts are due to the computer being used by a previous owner. Now that Christmas is coming around it's the perfect time to get some upgrades. However, I have no idea what is causing this problem. My PSU and GPU are not even a year old. If anyone can help shed light on this problem I would appreciate it greatly.