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EVGA Z370 Classified K (134-KS-E379)
System does not POST, and POST code
indicator reads "C"
When the system powers on, the POST code indicator should cycle through several
different codes before booting. However, if the boot process does not complete, you
should look at the LED indicator, as it will give you diagnostic information. When a
POST code indicator cycles through codes and stops at a specific code, this is an
indication that initialization of a specific component or process on the board failed. If
you power on the board and it goes directly to "C," and nothing else, that is an
indication of a CPU-related issue. If the board cannot
detect the CPU in the socket, the POST code display
will display a "C", as well. It is not likely a faulty CPU,
although it is possible; instead, it is most likely a CPU
power issue. Above the CPU socket, there will be one
8-pin and one 4-pin power connectors (outlined in the
picture to the right). These connectors are the main
power for the CPU and without power from the PSU,
the system cannot fully power on and initialize. The
8-pin connector must be plugged in; the 4-pin is
optional.
Make sure the plug is fully-seated and also make sure
that the tab on the socket and the release on the
power connector are on the same side (outlined in the
picture to the right). If the connectors do not line up,
then you have plugged in a PCIe 8-pin into the EPS
connector, which may cause irreparable damage to the
motherboard or the CPU.
If the PSU is modular, make sure the cable is fully-
seated on the PSU side as well. Also, only use cables
from your PSU manufacturer for your specific PSU, because using a cable designed for a
different PSU may have catastrophic effects. Finally, ensure that the cable on the PSU
side is plugged into the connector for the CPU, typically labelled "CPU" or "EPS," but
consult your power supply manual for the correct plug.
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