Question New Motherboard no power no LEDs after BIOS Flashback (ASUS B650e-i)

[shipmaster1995]

Hi all,

I recently RMA'd an Asus b650e-i mobo after it wasnt receiving power properly. The way this was diagnosed is that there are LEDs by the audio jack that were flashing rather than staying solid (an Asus rep told me this indicates power delivery issues).

I returned the board and got a new one. When I was assembling it everything seemed fine. I plugged it into the PSU and the audio jack lights on the mobo were solidly on indicating there was power (note: this doesn't mean I turned it on, these LEDs are always on when the board is connected to the PSU). I did a BIOS flashback, and the LEDs were still on once it was complete. I wanted to try turning on my pc, so I brought it to my room and hooked it up to my monitor, keyboard, and mouse, but pressing the power button did nothing (no fans spinning or anything). Before I tried turning it on, the mobo LEDs at the audio jacks were still on when I plugged it into my room.

I unplugged and took my PC back to the living room where I work on the dining table for more space to check if I incorrectly wired the power button, but now when I plug it into the wall there I noticed there were absolutely no signs of power even from the audio jack LEDs (the mobo LEDs).

Could I have somehow shorted it in this small timeframe between my room and the living room? I assume the fact that there was power earlier means that there shouldn't have been an issue, but maybe trying to press the power on button or the BIOS flashback did something?

I've taken the build apart since then and tried doing a bench test without the GPU plugged in. Still zero LEDs on the mobo when plugged into power, even after trying to jump start it manually with a screwdriver, and resetting CMOS. I also did a paper clip test on the PSU and it seems to be working still because the PSU fans still spin up for a short while (I'm pretty sure it has the low power mode because it only spins for a few seconds when I do it, the model is Corsair SF750)

Specs
CPU: Ryzen 7800x3d
CPU Cooler: ID-Cooling IS-55
Motherboard: Asus B650E-I
Ram: 2x16gb G.Skill Flare X5 DDR5 6000
SSD: WD Black 850x 2TB
GPU: Radeon 7900XT
PSU: Corsair SF750
Chassis: Formd T1 v2 Sandwich
OS: Windows 11 Pro(? I cant remember if its pro or home)
Monitor: AOC 24inch 1080p

 

[Lutfij]

Welcome to the forums, newcomer!

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model.

You might want to try and breadboard the system, in fact you should be able to get display output using the iGPU on the processor.

I also did a paper clip test on the PSU and it seems to be working still because the PSU fans still spin up for a short while (I'm pretty sure it has the low power mode because it only spins for a few seconds when I do it, the model is Corsair SF750)
Paperclip tests are moot, they don't tell you how much power the PSU can effectively output. In fact, did you try working with another PSU that's reliably built borrowed from a friend or neighbor?

 

[shipmaster1995]

Welcome to the forums, newcomer!

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model.

You might want to try and breadboard the system, in fact you should be able to get display output using the iGPU on the processor.

I also did a paper clip test on the PSU and it seems to be working still because the PSU fans still spin up for a short while (I'm pretty sure it has the low power mode because it only spins for a few seconds when I do it, the model is Corsair SF750)
Paperclip tests are moot, they don't tell you how much power the PSU can effectively output. In fact, did you try working with another PSU that's reliably built borrowed from a friend or neighbor?

Sorry about that, first post on here.

CPU: Ryzen 7800x3d
CPU Cooler: ID-Cooling IS-55
Motherboard: Asus B650E-I
Ram: 2x16gb G.Skill Flare X5 DDR5 6000
SSD: WD Black 850x 2TB
GPU: Radeon 7900XT
PSU: Corsair SF750
Chassis: Formd T1 v2 Sandwich
OS: Windows 11 Pro(? I cant remember if its pro or home)
Monitor: AOC 24inch 1080p

Whole build was bought in June 2023. I did not try another PSU because I don't really know anyone in the area with a custom PC. I guess I could check reddit and see if anyone in the area is willing to help. Alternatively I thought about getting one of those PSU testers from amazon, but I still haven't pulled the trigger.

And could you expand upon breadboarding the system? I don't know how I could get display output using the iGPU if my mobo doesn't seem to even get any power.