Here is the step-by-step sequence every technician must memorize. Note: Voltages are for modern DDR4/DDR5 platforms.
With all voltages up, the PCH:
Once PLTRST# is de-asserted, the CPU comes out of reset, fetches the first instruction from the BIOS SPI flash, and the POST (Power-On Self-Test) begins. You will see diagnostic LEDs cycle or hear beep codes. desktop motherboard power sequence pdf exclusive
The online version of this article contains a simplified diagram, but the exclusive PDF (download link at the end) provides:
This is where the CPU comes alive. The PCH sends VR_EN (Voltage Regulator Enable) to the main Vcore controller. The VRM then: Here is the step-by-step sequence every technician must
After Vcore is stable and within 95% of its target, the VRM sends back VR_READY (also called PGOOD or VCC_SENSE) to the PCH.
Exclusive Timing: Vcore must ramp from 0V to target voltage within 1ms to 3ms. Slower than that, and the PCH will assert a reset. Once PLTRST# is de-asserted, the CPU comes out
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