Question Motherboard Lights cycling between VGA, CPU and DRAM

Jun 29, 2021
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System:
Motherboard: Gigabyte Arous B450M
CPU: AMD Ryzen 3900X
GPU: XFX Triple Dissipiation 5700XT
RAM: G.SKILL Ripjaws V Series 32GB (2 x 16GB) F4-3200C16D-32GVK

So my PC had been working fine until now.
For Windows 11, you need secure boot & TMP to be enabled. I was playing around my BIOS and saved something in CSM and other secure Boot settings and rebooted my PC and now it doesn't turn on.

My board has 4 lights. VGA, CPU, DRAM, and Boot.

When I press the power on, the VGA light turns on for a second and goes off. Then the CPU light turns on for a second and then turns off. Then the DRAM light turns on for a second and turns off. Then the PC turns off, turns on again and the cycle continues.
The same thing happens when I disconnect my GPU.
But when I remove the RAM sticks it lights up the DRAM solid indicating no RAM.

I did try clearing my CMOS. And It did clear the CMOS. I know it because I had kept my board and fan LED RGB LEDs in OFF mode.
After the CMOS Clear, it now lights up the board & RGB FAN LEDs in the default color.

Now, the following happens
When I press the power on, the CPU light turns on for a second and then turns off. Then the DRAM light turns on for a second and turns off. Then the board's & fan's RGBs turn on. Then, the VGA light turns on for a second and goes off. Then the CPU light turns on for a second and then turns off. Then the DRAM light turns on for a second and turns off. Then the PC turns off, turns on again (the fans & board's RGB is still on) and the cycle continues.

I'm unable to understand what exactly the issue is.

Any help would be appreciated.
 

dorsai

Distinguished
Your board has a the dual-bios feature so make sure it didn't flip to the backup bios on you due to your changes.

Unplug the power cord from the PC and remove the BIOS backup battery for 5 min...the battery is just above the GPU slot.

After 5 min follow the BIOS reset procedure on the primary bios, then reinstall the battery, then restore AC power in that order and test the system.
 
Jun 29, 2021
6
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10
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Your board has a the dual-bios feature so make sure it didn't flip to the backup bios on you due to your changes.

Unplug the power cord from the PC and remove the BIOS backup battery for 5 min...the battery is just above the GPU slot.

After 5 min follow the BIOS reset procedure on the primary bios, then reinstall the battery, then restore AC power in that order and test the system.
Hi,

I tried your suggestion. I still see the same issue.
 

dorsai

Distinguished
You might want to get in touch with Gigabyte tech support and see if an RMA is possible. You can try stripping out everything except the cpu, gpu, and 1 memory module...if it still wont let you into the BIOS it sounds like the board is bricked.
 
Jun 29, 2021
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You might want to get in touch with Gigabyte tech support and see if an RMA is possible. You can try stripping out everything except the cpu, gpu, and 1 memory module...if it still wont let you into the BIOS it sounds like the board is bricked.
Thanks for your help.
  1. So When I had everything plugged in, I had the same issue.
  2. When I remove the GPU, it's the same thing.
  3. When I remove any 1 of the RAM & place it in any of the positions, it's the same thing.
  4. When I remove both the RAMs, there's a solid red light on DRAM.
Because of this behavior, I wasn't really sure what hardware component the issue was in.
 
Jun 29, 2021
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I just got a new motherboard from MSI but and I see the same issue on it too. So probably it's not an issue with the motherboard. Any ideas?
 
Jun 29, 2021
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Finally figured out the issue. The 2 sticks of RAM are working individually and they are working in single-channel mode. i.e they when I install them in slots 1 & 2 or 3 & 4, then it works fine. But if I install them in slots 1 & 3 or 2 & 4 in dual channel mode, then it triggers the light cycle. Any idea how I can fix this and which component has the issue exactly?
 

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