Odd crash is occuring PLEASE HELP

[SystemofaSyndrome]

A PC built for my friend in December of 2014 has had issues in the past with a motherboard but the problem was fixed.

The new issue for this PC is that it now has flashes on the monitor, extreme tearing, and random displays of chronological colors.

I have tried unplugging the webcam, the keyboard/mouse, changed the keyboard/mouse, changed the monitor, used 2 monitors at one point, and switched the channel the ram was in.

I think it may be the GPU but I am unsure.

The cable can't be the problem either because it is one display port I and one HDMI for each monitor tested.

I wanted to check the temps but the PC will not go past the MOBO screen unless it is to the recovery screen, in which case it glitches out until the screen goes windows 8 light blue.

This PC runs Windows 10, has a R9 270X, has a 970 MOBO, 6300 CPU, some 1600 RAM I can't remember atm, a 650w PSU, and a terabyte hard-drive.

(MOTHER BOARD DOESN'T HAVE ONBOARD GRAPHICS SUPPORT)

 

So again, my only thoughts are:

1. Ram
2. CPU
3. Cooling
4. GPU

If you can help please do, below are some videos of some of the problems.

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[JerkyMcDilerino]

Probably GPU problem. 

[RossMadness]

Remove the GPU and plug the video cable into the motherboard. See if it displays normally. If so, then the GPU was the issue. Alternatively, if you have a different GPU, plug that in and see how it works.

[RossMadness]

Nevermind. I missed the "no onboard graphics" portion and can't edit my other post from my phone. Sorry about that. Still, try putting a new GPU in there.