Black screen only when watching video's or movies. Can hear sound no display.

Windows 8.1
Processor: AMD FX(tm)-6300 Six-Core Processor 3.50 GHz
Installed memory (Ram): 14.0 GB
System type: 64-bit Operating System, x64-based processor
Display adapter: AMD Radeon R7 200 Series

It's very random when it does crash but when it does I can hear sounds for a few minutes then it stops.
Have to hold down button to get it to restart nothing else will work.

Pretty new to computers so have no idea how to go about fixing this and would need to be talked through it.

Thanks in advance to anyone willing to spend their time helping me on this.
 
I just repaired a computer with the same problem. It was infected with a lot of malware. I used RKill, Malwarebytes and JRT to clean the machine. Once all the scans were complete I rebooted the laptop and things worked as supposed to. Hope this helps.
 
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