I need a special HP disk for them because they all have some kinda firmware lock which is preventing anything earlier than Windows 7 from being installed to them. XP and vista will just blue screen when attempting to install either of those.HPs website says XP and Vista
It seems like a common issue for these particular machines from my google searches. Maybe a BIOS flash might solve things...
This is what happens when I attempt to install Windows XP. its the same on all three of the machines.
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