[Solved] Intel HD 4600 and black bar

[firecall]

Hi,

Having a weird problem where a thick black out bar appears down left hand side of monitor. The right hand side monitor is good. Just the left. See image.

This board has two DP ports - I'm hooking up 2x Dell QHD displays via DP -> mDP cables.

Weirdly the login screen is good, but it gets the black bar after I've logged in. Any pointers anyone? not sure where to begin looking

Hackintosh: HP Pro Desk 600 G1 / i7

 

[firecall]

Hmm - it seems to have just randomly fixed itself

 

[firecall]

And now it's back. Unsolved. Weird.

I thought after running the OSX update and a reboot that it had fixed itself. But seemingly not.