Question No Power/System not starting unless CPU power cable is disconnected from the Motherboard

[Agoniyz]

Hello everyone,

I‘m slowly getting desperate, i‘ve spent countless hours searching the web and trying to find out what caused this.

I recently exchanged my motherboard for a new one (MSI MPG B550 Gaming plus AM4).

CPU is Ryzen 7 5800x

After the install - everything ran like butter and the PC was working well fpr about 1-2 days.

Yesterday I pressed the PW button and nothing happend, no lights, no fans nothing.

first I thought the PSU was faulty but I tested it with a paper clip and I even plugged it on another motherboard with the same CPU.

Worked fine.

So this is clearly a MOBO problem…thing is…itd brand new and it worked until it suddenly didnt.

Only thing I could notice when checking the cables was ou the little 4pin connector attached to the 20pin connector (AC power) not being insterted properly this whole time.

Unsure if that caused the Motherboard to fail…

Like the title says : Mobo runs aswell but ONLY when the 2x4 pin CPU power isnt connected

 

[Agoniyz]

Hello everyone,

I‘m slowly getting desperate, i‘ve spent countless hours searching the web and trying to find out what caused this.

I recently exchanged my motherboard for a new one (MSI MPG B550 Gaming plus AM4).

CPU is Ryzen 7 5800x

After the install - everything ran like butter and the PC was working well fpr about 1-2 days.

Yesterday I pressed the PW button and nothing happend, no lights, no fans nothing.

first I thought the PSU was faulty but I tested it with a paper clip and I even plugged it on another motherboard with the same CPU.

Worked fine.

So this is clearly a MOBO problem…thing is…itd brand new and it worked until it suddenly didnt.

Only thing I could notice when checking the cables was ou the little 4pin connector attached to the 20pin connector (AC power) not being insterted properly this whole time.

Unsure if that caused the Motherboard to fail…

Like the title says : Mobo runs aswell but ONLY when the 2x4 pin CPU power isnt connected

Id like to add: the white DEBUG LED is on (cpu) when the mobo seems like its running