[SOLVED] PSU cable to provide CPU Power not working?

[Sussyman694201337]

I have been getting a white ez debug cpu light on my mobo. No display is showing up. I feel like I should invest in a new PSU, but at the same time the rest of the pc functions, including fans of the GPU, case, and AIO, with the exception of the case light that indicates whether the pc is on or not. I have tried diagnosing by removing one stick of ram, disconnecting and removing GPU, and disconnecting HDD. Nothing seems to be working and I still get the white ez debug light for the CPU. This CPU and system has worked for 2 years since 2019 and this light came on in the summer of 2021, ruining my gaming adventures. I am very skeptical on whether this is a CPU problem or this PSU is the problem. I also don't know whether I would need a post card to diagnose further.

Specs: Random 500W Seasonic PSU, GTX 1060 6GB Zotac, i7-9700K, 2x8GB DDR4 G. SKILL Aegis, Z390 A-Pro MSI

 

[Karadjgne]

It's not a specific phenomenon. It's a security built into every cpu. If it registers low/no rpm on the cpu_fan header, the cpu will decide on its own to shutdown or refuse to boot.

Cpu_fan/cpu_opt are standalone headers, they do not share anything with any other header, for the reason above. They have a totally seperate buss address. The cpu_fan header had a 1A rating. The pump header has a 2A+ rating to handle any pump, whether AIO or full loop. It has a seperate buss address to system_fan headers, seperate controls in bios or software.

Most vendors will use one board for several versions, so an msi x570-A will be the same board as an x570-A Pro. The difference being what the board is optioned with. So you can sometimes see a cpu_fan header physically there, but the header for cpu_opt or pump isn't, even though the print is there. Doesn't mean they share a header, just your board wasn't optioned with the second header in that location.

If you plugged in the rear fan to the cpu_fan header and it didn't spin, which it should do as soon as power button is pushed, there's 1 of 2 options. It's either the cpu/bios has that header shut-down or there's an issue with the motherboard/cpu.

 

[Sussyman694201337]

It's not a specific phenomenon. It's a security built into every cpu. If it registers low/no rpm on the cpu_fan header, the cpu will decide on its own to shutdown or refuse to boot.

Cpu_fan/cpu_opt are standalone headers, they do not share anything with any other header, for the reason above. They have a totally seperate buss address. The cpu_fan header had a 1A rating. The pump header has a 2A+ rating to handle any pump, whether AIO or full loop. It has a seperate buss address to system_fan headers, seperate controls in bios or software.

Most vendors will use one board for several versions, so an msi x570-A will be the same board as an x570-A Pro. The difference being what the board is optioned with. So you can sometimes see a cpu_fan header physically there, but the header for cpu_opt or pump isn't, even though the print is there. Doesn't mean they share a header, just your board wasn't optioned with the second header in that location.

If you plugged in the rear fan to the cpu_fan header and it didn't spin, which it should do as soon as power button is pushed, there's 1 of 2 options. It's either the cpu/bios has that header shut-down or there's an issue with the motherboard/cpu.

Ok thank you for this information. The rear fan was spinning when the system was powered on. Also I misread my motherboard manual pump and cpu fan header is not shared. At this point i really don't trust the PSU, Motherboard, and CPU as I cannot come up with a diagnosis as to which one is bricked and which one isn't. The i7-10700k is starting to appeal more to me, and this MSI Z390A-Pro, tbh, is very much not to my liking. It has no RGB, isnt very visually appealing to me, and I have seen a bunch of complaints on it online. PSU is most likely in a must replace situation so I'll probably deal with that first.