EVGA Z390 DARK (131-CS-E399)
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button or cross posts with a screwdriver, which is a semi-common practice.
This button provides a safer and easier option than jumpering the Power posts.
19. Reset Button
This is an onboard system reset button, and may be used in place of, or in
conjunction with, a front panel system reset button wired to the board.
Benching systems, or test benches before final assembly, are best served by
using the onboard power because it removes the need to wire a Power/Reset
button or cross posts with a screwdriver, which is a semi-common practice.
This button provides a safer and easier option than jumpering the Power posts.
20. CMOS Reset Button
This button has two main uses: the first is standard practice to clear BIOS and
power on before updating the BIOS, and the second is standard practice when
troubleshooting instances when the motherboard fails to POST, such as after
upgrading RAM or CPU, installing new hardware, a failed overclock, etc. This
button provides a much faster means of resetting than the previous method of
removing power from the board, removing the CMOS battery, and discharging
power to the board. In rare occasions the older method can help; pressing the
clear CMOS button will normally allow you and your system back into the
default BIOS.
21. Debug POST Indicator / Hardware Monitor
This is a four-digit POST code reader, which displays in sets of 7-digit LED.
The display can be configured to show data in regular decimal format, or
hexadecimal, which means the characters available (when working as intended)
are 0-9, A-F and has a cap of 255 characters.
During POST, the left set of LEDs will display the various POST codes as they
cycle through the Power On Self-Test. The POST codes are listed in the
troubleshooting section on Page 153.
After the system boots, these same set of LEDs can be set to display a hardware
monitoring sensor, such as the CPU temperature in Celsius. This temperature
is specifically for the CPU socket, which will typically read slightly higher than a
given CPU core. To read this temp in Fahrenheit, take the value in Celsius,
multiply by 9/5 (or 1.8) and add 32.
The display can be used to show additional temperatures, or can be configured
in tandem with all 4 digits to provide live readings for voltages or temperatures.
For example, the LEDs can be configured to read voltages, such as 1.258 or -
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