MacBook Pro 2011 won’t load properly and screen flashes black!

So so my MacBook Pro was working absolutely fine earlier when suddenly Google Chrome decides to crash.

Had to power off and restart using the power key. When it restarted it wouldn’t load properly, was really slow and crashed again. The third restart the Apple taskbar failed to load. Fourth restart, everything loads but it fails if you try to open something and the screen flashes black. This is now continuing to happen every time I try to load.

What the !&&* is happening? Any help greatly appreciated!