Just a quick update. I am not now able to access the PC via the remote agent. Nor can I access the bios etc as I have now no visual reference at all. I did hot swap a different drive to see if I could get some visual output but no joy. I also tried booting from a live USB and a live CD but no joy also.
Amber and White light blinking. What is the meaning of
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Computer POST and beep codes
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try downloading and reinstalling the graphics driver. If that doesn't work try Clearing CMOS to make sure someone didn't disable display out it in bios (has happened to me before)
Apparently you are right, even after the BIOS update with the 9575 processor (I assumed that the list of CPUID with the new Haswell would be updated) Nothing has changed.