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Troubleshooting the System Memory - Parity Errors

Parity errors are generated whenever the built-in error detection and correction system in the chipset determines that a memory error has occurred. The message is generally the same whether standard parity checking is enabled, or the more advanced ECC detection and correction. When an error of this sort occurs with ECC enabled, it means that an error of two bits or more (which ECC cannot correct) has been encountered.

It is important to realize that not all parity error messages mean that there is a problem with the memory, or even the motherboard. For example, resource conflicts can cause parity errors. The causes of parity errors vary greatly depending on whether the error message occurs when the machine is first booted up, or while the system is in general operation. For this reason I have two different troubleshooting sections, one for each of these two scenarios.

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