AMD Ryzen 9 7900X and MSI PRO B650M-A WIFI - EZ Debug CPU Light - Red

[chiller15]

I'll start off this thread with the fact that I am an experienced IT techie...but that doesn't mean I haven't done something stupid or overlooked something!

 

In my workplace, we have bought 2x systems for our professional workload:

 

CPU: AMD Ryzen 9 7900X

Motherboard: MSI PRO B650M-A WIFI

RAM: 23GB (2x 16GB) Corsair Vengeance 5600MHz CL36

Cooler: Be Quiet! Dark Rock Pro 4

PSU: Montech 80+ Gold 650W

Storage: 1TB Samsung 980 Pro with heatsink

 

Both systems are experiencing the exact same issue - not posting, with the CPU LED red and the RAM LED amber on the motherboard (which means the board hasn't detected the CPU and RAM according to the manual).

 

Troubleshooting steps I've performed:

• Removed all but the CPU, cooler, RAM and PSU
• Removed the RAM - no beeps to complain that RAM isn't installed
• Reseated the RAM
• Reseated the CPU
• Checked for damage in the LGA socket and also on the CPU itself
• Ensured that the CPU has enough thermal paste
• Used just the 8-pin power
• Used the 8+4 pin power

I'm currently at a loss as to what the issue could be. I don't know if the CPU is receiving power or not and currently don't have another PSU to try.

[191x7]

Ok, can you confirm the CPU-s are 7900X and not the new 7900X3D?

 

Do the boards have Bios flashback so that you could try flashing the latest Bios?

[chiller15]

2 minutes ago, 191x7 said:

Ok, can you confirm the CPU-s are 7900X and not the new 7900X3D?

 

Do the boards have Bios flashback so that you could try flashing the latest Bios?

They are definately the 7900X, not the 3D.

 

The board does have a flash BIOS button above the rear IO, though I'm not sure how since I have no display output.

[191x7]

7 minutes ago, chiller15 said:

They are definately the 7900X, not the 3D.

 

The board does have a flash BIOS button above the rear IO, though I'm not sure how since I have no display output.

[chiller15]

2 minutes ago, 191x7 said:

Thans, I found that in the manual minutes after posting, but was waiting until the process completed before posting!

 

Sadly, flashing with the latest (non-beta) BIOS didn't work, I still have the same LEDs and no display.

[191x7]

8 minutes ago, chiller15 said:

Thans, I found that in the manual minutes after posting, but was waiting until the process completed before posting!

 

Sadly, flashing with the latest (non-beta) BIOS didn't work, I still have the same LEDs and no display.

Is the RAM in the correct slots?

Tried with a single RAM stick?

Is the RAM on the QLV list of the motherboard?

[chiller15]

40 minutes ago, 191x7 said:

Is the RAM in the correct slots?

Tried with a single RAM stick?

Is the RAM on the QLV list of the motherboard?

I've got the RAM in slots A and C, which are the traditional dual channel configurations. Using one stick or no sticks at all doesn't change the behaviour.

 

Both the CPU and RAM modules (CMK32GX5M2B5600C36) are listed as compatible products.

 

Update:

 

Using RAM slots A and B made it post after about 30-40 seconds.

 

Update 2: Checking the manual states the recommended RAM slots used as B/D for dual channel and B for single. Using slots B/D allowed for a sucessful boot.

 

Clearly this was a case of RTFM and my old knowledge of using slots A/C!

 

Edit: Thanks for the assist @191x7