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Gate A20 error message

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by dkwaczala

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Have a Server with WINNT for an operating system. Customer reports getting a A20 error message. I know the problem can only be a motherboard or keyboard problem. Is there any other piece of troubleshooting I can do or could there be any other problem that would cause this. Customer reports this keyboard is connected thru a switch which services 5 servers and only one of them has this problem?

3 replies

by dpalsen

Sadly, they could have blown the motherboard's KB interface. I've seen rare cases where these switches send a surge down the line each time they're switched, which over time weakens and eventually blows the circuit on the MoBo. Sorry I don't have better news. The obvious bit of troubleshooting would be to just plug a keyboard and mouse directly into the machine, and remove the switch from the loop. That might at least tell you a little more.

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