Can't PXE Boot some Optiplex 780s

We've got a bunch of Optiplex 780s that fail on ConfigMgr PXE boot with the error message:
    PXE-E53: No boot filename received

I have at least 1 780 that boots and images just fine so it's not a network issue. I can't find anything different between the good machine and the rest of them except the ones that are failing are newer.

Intel Boot Agent GE v 1.3.81
Bad Machine Manufacture Date 7/12/2011
Good Machine Manufacture Date 7/21/2010

We're using MSFT ConfigMgr 2012 1610 v 1526

I see a lot of really old threads here re this issue that mention older BIOS updates solving it but we're running a much newer BIOS. Has anyone else run into this issue with the 780s recently?



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RE: Can't PXE Boot some Optiplex 780s

Well, what BIOS version is running on the good machine?

I'm thinking the same as others; I've had to roll back other Dell devices before to bring back PXE functionality.

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