Dell optiplex 755 motherboard guide

i am having a problem with my computer first i get a bluscreen parity check /memory parity error
then i check my ram it's ok and i unplug all the device's attached to my mother board then it changes to stop:0x0000007b error pls tell me the problem or how to reset the mother board
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  1. A stop 0x0000007B error usually occurs because you are booting from a hard disk that came from a different system, you replaced the motherboard by one that has a different chipset or you changed the disk controller configuration from IDE to AHCI or RAID. Go into the BIOS configuration and check your disk controller settings.
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