I had this issue too, downgrading rEFINd to v11.0 fixed it.
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Posts
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RE: HP 705 G4 - rEFInd Initializing....posted in FOG Problems
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RE: Boot from Hard Disk from Fog Server PXE doesn't workposted in Windows Problems
Managed to get this to work by downgrading rEFInd to version 11 as per this:
https://forums.fogproject.org/topic/11993/refind-pxe-booting-issue