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We are going through the same sort of testing, and we have found a similar UEFI issue, and we get through the PBA screen fine with mouse etc working ok, but there get a black screen and the system never boots. This seems to be due to the boot disk being GPT in the default implementation we are getting. From what I can see in various documents around the Mcafee site there may or may not be an issue with this depending on which one you read. we are running the latest version of DE, and through our discussions with HP on our test models (X360 G2) this could be something to do with the Kabylake processors as its being reported on the 850 G4 Elitebook also.
If I get any new information I'll post it here
So it seems that installing the latest BIOS along with updating your Hardware Compatibility list (HCL) in ePO will solve the issue.
So the first thing to do it update the BIOS.
If you still have issues, McAfee recommends you have the system take a new read on the latest HCL. unfortunately, the HCL is ONLY read once! Upon activation. So you would have to completely decrypt the system, and re-encrypt it, in order to read the new HCL! Hopefully the BIOS will solve the issue. It did for us. But you should update your HCL anyway. ePO doesn't do it automatically.
In ePO. it's under Server Settings / Drive Encryption / Hardware Compatibility Settings. Ours is currently version 68. You will have to get the new XML file from the support portal.