What type of HDMI cable are you using? HDMI to HDMI or any adapter
Are you selecting HDMI source on your monitor?
Are you getting any black screen when connecting second monitor? if so, please check this link: Test Driver for HDMI Display Detection Issues
Thank you for your response,
I'm using an HDMI to VGA adaptor, then the monitor says check cable.
Initially I thought it was the cables fault but this same cable worked on another pc to this monitor.
I have tried every other fix imaginable, with unistalling drivers reinstalling them from multiple sources and trying every possible setting but the laptop still won't detect a second monitor from the hdmi output.
Would I be better to buy a USB to VGA adaptor?
I would say the problem is the HDMI to VGA cable, Intel recommends using same ends on both sides of the cable for proper multi monitor functionality.
If possible try using active video cables.