System fails to start.
System fails to start.
Thanks to DarkWaterSong, I understood why my day was wasted yesterday. I realized I hadn't set up the GPU correctly. Since I bought a CPU with an APU that doesn’t actually have one, I only tried booting it normally. That caused a VGA error and eventually led to hardware failure—probably because I thought the GPU was missing after it couldn’t locate it.
Reinstall the GPU and verify that the power cables are securely connected. Please inform us of your experience.
I've already tried reinstalling the GPU and connecting an external component to the CPU fan port. The issue persists with the same error and the BIOS lights remain active. Could someone spare a moment to offer live assistance?
Thanks for your help. I realized the issue was the CPU fan detection problem. It was a 360mm AIO with a faulty hub, and the Z790-H BIOS mistakenly thought the fan was damaged. This caused it to boot into BIOS thinking something was wrong.
Also don't worry about the AGU situation—I've experienced it before. That's why I'm supporting AMD. You just need to understand why you shouldn't connect the CPU fan directly to a hub. Knowing this helps you choose the right 4-pin connectors, which are essential for both CPUs and case fans. You can use 3-pin connectors in 4-pin spots, but they tend to run at a fixed speed. I've noticed that adjusting voltage with 3-pin fans isn't as effective as using 4-pin ones. Also, it might be helpful to check if your monitor's internal labeling is correct—sometimes things like HDMI and DP are swapped, or a firmware update is needed. Occasionally, a faulty monitor cable can cause similar issues. Lastly, try using a second DP cable just in case.
for the monitors, I haven’t switched cables again because I trusted the one I had, just enabled compatibility mode in BIOS. The only issue left is with the thermal management—CPU speeds drop to 4.7 GHz under full load on all 16 cores instead of the expected 5.4 GHz. I’m not sure what’s causing this now.
It turns out improving the cooler or thermal paste on the CPU makes a big difference. A good option might be a Noctua D15 or 280mm radiator with strong fans. Some pre-applied thermal compound on standard coolers isn’t very effective. I personally saw a drop of nearly 10 degrees Celsius by swapping out the stock stuff for Noctua’s instead. Room temperature also plays a big role—hotter environments hurt performance unless you use air conditioning or liquid cooling. Also, think carefully about handling hazardous materials like liquid oxygen; it’s not something to take lightly.