ASROCK Z790 Steel Legend WiFi User Manual page 52

2.13 Post Status Checker
Post Status Checker (PSC) diagnoses the computer when users power on the
machine. It emits a red light to indicate whether the CPU, memory, VGA or
storage is dysfunctional. The lights go off if the four mentioned above are function-
ing normally.
BOOT
CPU
DRAM
VGA
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