World of Warcraft picture stuck in the table clothes.

Another possibility is that the CPU model of your computer is old.

Because the CPU is outdated or too old, if you take Warcraft for a long time, the CPU will overheat and make your computer run slowly. Therefore, the sound can be heard, but the image will not be displayed. It is also possible that there is too much dust in your exhaust fan and the heat dissipation effect is poor, resulting in overheating of the CPU. Generally speaking, CPU below 2.0 may encounter this problem.

If you are a laptop, I suggest you clean the exhaust fan.

If you have a desktop, try not to put the host in a crowded place. Ventilation is very important. Computers are also afraid of heat, and it is easy to burn out hardware when it is too hot in summer.