Question After power on and and logging into windows pc quickly goes blank.

Jul 14, 2019
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Hi all,
I have just built a new pc and installed windows 10 home onto it. After booting and logging on to windows o can use the computer for a short amount of time then the screen goes black. All the lights on the case stay on however. Including the power button light. I have to do a hard power off as I cannot access anything on the screen. I have already tried a reinstall of windows and also have tried the RAM in different motherboard slots.
Thanks for any help.

My PC:
GTX 960
Ryzen 2600
MSI Tomahawk B450
Kington Fury 2x8gb RAM (2400mhz)
500w PSU