Com 226 comp trouble shooting II theory book


Beeps Keyboard controller / gate



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com-226-computer-troubleshooting-ii-theory
6 Beeps
Keyboard controller / gate
A20 failure
The keyboard controller is a chip on the motherboard that communicates with your keyboard. It also controls the Agate that provides access to the high memory area
(HMA)
. This component is indicating a failure. This is usually a problem with either the keyboard or the motherboard Troubleshooting the keyboard is relatively easy try that first. Troubleshoot the keyboard controller. Troubleshoot as a motherboard failure
7 Beeps
Virtual mode exception error
There is a problem related to the processor or motherboard. Troubleshoot the processor.


Beep
Explanation
Diagnosis
Troubleshooting steps
Virtual mode is one of the different modes that the processor can run in. The system is reporting an error when testing this mode.
Note that this doesn't mean that the processor is necessarily dead, since the system won't boot at all with a dead processor. Troubleshoot the motherboard.

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