So i just got in a shipment of Dell D830s, and im trying to do a PXE boot to our WDS servers....but when I get past the boot option screen to the pre PXE screen that asks for "Press F-12 for network boot"...my F keys appear to be disabled. This is strange because I use f-12 to get to the boot options menu. I've messed with every Bios option I can think to, and Google has only turned up changing my WDS config, which i would rather avoid as it works with every other model.
Is there an f-lock key? I've come across this on media centre type keyboards but not on anything else.
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Recent Dell computers have a BIOS setting that swaps the default position of the Fn key. Try using Fn+F12 or going to the BIOS and toggling that setting.
I know you said it can't be this because you can use the key to get boot options, but I'm not convinced: the boot options may be looking for either F12 or the Fn version.