Using The Post Code Indicator To Troubleshoot; System Does Not Post And Multi-Function Display Reads "C - EVGA Z790 CLASSIFIED User Manual

EVGA Z790 CLASSIFIED (121-RL-E798)

Using the POST code indicator to troubleshoot

When the system powers on, the Multi-function Display should cycle through several
different codes before booting. However, if the boot process does not complete, you
should look at the POST codes shown on the display, which functions as a debug LED.
When the Multi-function Display cycles through codes and stops at a specific code, this
is an indication that an error was detected at a specific point during the boot process.
Some POST codes are very specific about the type of error it detects; other POST codes
indirectly point to certain components or processes that may be occurring. Use the
POST Code list on Page 113 to help diagnose common errors during the boot process.
System does not POST and Multi-function Display
reads "C"
If you power on the board and the display reads "C", this is an
indication of a CPU-related issue. This issue could occur due to a
faulty or incompatible CPU, bent pins in the CPU socket, or
simply that the CPU is not receiving power. We suggest to first
check that the CPU is receiving power. To the right of the CPU
socket, there are two 8-pin power connectors (outlined in blue
in the image to the right) that provide direct power for the CPU.
Without power from the PSU, the system cannot fully power on
and initialize. The Z790 Classified has two of these connectors;
at least one must be plugged in. If your PSU only has one 8-pin
CPU power cable (sometimes designed with two 4-pin
connectors), you may use either port.
Make sure the CPU power connector is fully-inserted
and also make sure that the tab on the socket and the
release on the power connector are on the same side
(see the blue boxes in the second picture). If the tabs
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. For the Z790 CLASSIFIED,
inserting an 8-pin PCIe connector will likely damage the PCB due to the right-angle
connectors.
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