UREAL GUYS!!!!
IT IS WORKING!

for some reason it must have disabled or disconnected my GPU, thank you so much for the support and the quick and efficient help!
you guys are awesome!!

is there any way I can give you a rating or feedback, because this was by far my best troubleshooting experience ever!!!
thankyou so much!

and is the GPU that I am running suffice for playing ARMA3?

what driver would you recommend?

my computer currently has directx 11

I have a new laptop, and the GPU on it is a NVIDIA GeForce 940M.
I haven't used anything else, and it doesn't make sense that its not working if I was playing ARMA 3 last night perfectly fine.

can I update these online or do I need to purchase from a shop?
I may not have directx, I will have a look now

thankyou

it has worked, but now when I click on play it comes up with a new window with a red 'X' saying:

"cannot create DX11 device:

Adapter (NVIDIA GeForce 940M ) Fullscreen Resolution 1366x768, format R8G8B8A8_UNORM, refresh 60 Hz Error DXGI_ERROR_UNSUPPORTED

last night I was playing ARMA 3 and everything was fine but now this is happening

and after I exited out of this window, another popped up saying:

"Arma 3 has quit in unsual manner. Info:

Exit code: 0x00000001/1
Time running: ~ 00:05:14.4

https://community.bistudio.com/wiki/Arma_3_Unusual_process_exit