https://www.displayport.org/cables/how-to-choose-a-displayport-cable-and-not-get-a-bad-one/
Their certified list:
https://www.displayport.org/products-database/?products_category[]=cables-connectors&products_manufacturer=
I think this is the one I bought, but I don't seem to have any records of the purchase (which is odd, I keep everything...) It was £15.
https://www.accellcables.com/products/ultraav-displayport-to-displayport-version-1-2-cable
e: It was "Accell B088C-007B 6.6ft Ultra AV Display Port Cable" and it was £10, not £15![]()
ok thanks bud will give it a go and let you know if it fixes the problem.