After testing a bit more I have tracked down the fault to be related to disabling legacy boot. With the 0024 version of the bios display port stops working if you disable legacy boot..
I assume this is not intended and will be fixed sometime?
To reproduce the issue, it is enough to update to the latest bios (0024), reset the bios settings (F9), then turn off legacy boot and restart..
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I am sorry to hear that have had issues with latest BIOS version 0024.
The Intel engineering department is aware of this thread and they are currently working to get this issue resolved. I still do not have an estimate time of resolution.
This problem was reported previously here: https://communities.intel.com/thread/49093