OptiPlex 780 A15 Bios error 2 and 4

It seems that every Dell Optiplex 780, version minitower, 0C27VV motherboard that I saw that was updated BIOS version A15 poster code error 2 front and 4 on reboot.  They do, however, start ok to power.  Why isn't it posted anywhere?  What is the solution?  How the BIOS can be reversed to say, A12.  Otherwise, this is a great computer, just make sure you do not update the BIOS A15.

Dale al.

[Admin note: personal information]

My apologies, RoHe, that's what you're missing.  The monitor is connected to the computer via a KVM Linkskey switch.  When the monitor is connected directly to the computer, the problem disappears.  Thank you for your time.

Tags: Dell Desktop

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