[SOLVED] Functional GPU not recognised on new MOBO

[martouille7]

Hi all,

Getting depressed
First time in a while that I update my kit, and opted for a new MOBO and CPU.

Problem is that no matter what I try, I get no output on monitor, and "VGA" LED on the MOBO.

Full kit:
CPU : Ryzen7 5800X (new)
MOBO : NZXT N7 B550 got the issue first, figured it may be the MOBO not working, so purchased ROG STRIX B550-F, but same issue. (new)
GPU : RTX 2080 (old)
PSU: COUGAR power 700 CGR B2-700 (old)
RAM : Vengeance LPX - DDR4 (new as previous RAM were incompatible)

Tried to :

• CMOS
• BIOS Update
• Boot with strict minimum (GPU and 1 RAM only, that I tried on all sockets, not even the CPU cooler)
• GPU on both PCI-E
• Plugged monitors with both HDMI and DP

Figured I need the CPU plugged, as the ryzen does not have a graphic int.

Any idea?

Thanks !

 

[Lutfij]

Welcome to the forums, newcomer!

As you state changing the motherboard/platform, you're recylcing your older OS drive?

PSU: COUGAR power 700 CGR B2-700 (old)
How old is the unit?

RAM : Vengeance LPX - DDR4 (new as previous RAM were incompatible)
Got a link to the ram kit? Also, which slots are the rams populating on the motherboard?

 

[martouille7]

Hi and thank you for your time !

RAM : https://www.corsair.com/fr/fr/Catégories/Produits/Mémoire/VENGEANCE-LPX/p/CMK16GX4M2B3000C15
plugged in slot DIMM_B2 as mentioned in user guide

For the PSU I don't remember ever changed it, so 2016. But if I did, it was back in 2019 when I would have swapped GPU.

Note that everything else seems to start correcty (fans etc)

 

[martouille7]

Update : I purchased a new PSU 850W and it worked like a charm (even surprised that I didn't have even to install Windows!)

So for a weird reason, indeed the PSU was not power enough / too old ?