You could be right, it may not be a driver issue. We've got this problem on all 7250 & 7450s we've tested. We stopped at 5. All other models (15+ Dell, Lenovo etc) are fine. It could be the BIOS, not 100% sure what as I can't really find anything in the BIOS that could possibly be causing it. The strange thing is, the machines all PXE boot. In the past when computers have failed to boot to SCCM, it's because there isn't a correct driver in the boot image and they won't PXE boot, period. However with the 7250s & 7450s they do PXE boot and start loading the WINPE image which means the NIC driver in the boot image is working, at least for a period of time.
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