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I am receiving a parity error as soon as I boot up the PC
Explanation: A parity error is occurring on a PC as it boots up. The parity error will typically occur as soon as the system completes the power-on self test; the memory count that is performed will typically pass without any problems being recognized. In some cases, when booting up Windows 95 or Windows NT for example, the parity error will not appear until the graphical user interface of the Windows operating system itself comes up on the screen.
Diagnosis: The most common cause of parity errors when first booting up the PC are incorrect configuration or using the wrong type of memory. It is unusual for an actual memory failure, of the type that parity checks for (meaning, you wrote one value into memory and read back another value with a bit changed) to be encountered at the start of booting, although it is possible.
Recommendation: Look on the screen to see if the system is giving you any sort of memory address that indicates where the parity error is occurring. Reboot the system and see if the same address comes up again, and then reboot a third time. Take note of whether or not the memory location changes, and then continue below: