PC won't post

[Bluieee]

Hello everyone, 

new to posting here and i would appricate anyone help.

So a month ago i built a new PC with follwoing spec : 
MSI B550-A pro 
Ryzen 5700x
Corsair vengance LPX 3200mhz (16gbx2)
Corsair rm750x
1TB Crucial P1 NVMe M.2 2280 PCIe 3.0 x4
ASrock phantom gaming RX6800

So everything was working perfectly fine , i got a new PCIe 4.0 ssd and i wanted to instal it . so i took out my GPU so i can seat the new nvme in the PCIe 4.0 slot and bring the old one to the PCIe.3.0 slot.
i put everything together and the PC refused to post , and the debug led on the mobo shows vga error 
i tried reseating gpu , using another PCIe slot , cleaing . nothing seemed to help 

i borrowed a freind GPU and it did not work in my system (only tired the top PCIe slot) , and my GPU did work in anohter system 
i ruled its a Mobo issues 

next day i pick up another mobo (Asus Prime B550-Plus)
and the intersting thing here , the GPU DID NOT WORK on the man picie slot but it DID WORK on the secandary one .
i tired changing the slot from auto to both 3.0 and 4.0 and nothing seemed to help. 

any help on how to go about digonising the issues would be highly appricated , im just so stumped and over all panicking.
Could it be somehow the CPU ? 

Thanks in advance

[BeastyB314]

Try reseating your ram, sometimes its that simple

[zipspence]

4 hours ago, Bluieee said:

Hello everyone, 

new to posting here and i would appricate anyone help.

So a month ago i built a new PC with follwoing spec : 
MSI B550-A pro 
Ryzen 5700x
Corsair vengance LPX 3200mhz (16gbx2)
Corsair rm750x
1TB Crucial P1 NVMe M.2 2280 PCIe 3.0 x4
ASrock phantom gaming RX6800

So everything was working perfectly fine , i got a new PCIe 4.0 ssd and i wanted to instal it . so i took out my GPU so i can seat the new nvme in the PCIe 4.0 slot and bring the old one to the PCIe.3.0 slot.
i put everything together and the PC refused to post , and the debug led on the mobo shows vga error 
i tried reseating gpu , using another PCIe slot , cleaing . nothing seemed to help 

i borrowed a freind GPU and it did not work in my system (only tired the top PCIe slot) , and my GPU did work in anohter system 
i ruled its a Mobo issues 

next day i pick up another mobo (Asus Prime B550-Plus)
and the intersting thing here , the GPU DID NOT WORK on the man picie slot but it DID WORK on the secandary one .
i tired changing the slot from auto to both 3.0 and 4.0 and nothing seemed to help. 

any help on how to go about digonising the issues would be highly appricated , im just so stumped and over all panicking.
Could it be somehow the CPU ? 

Thanks in advance

On this issue in particular I would go for a BIOS upgrade/update for the first route of troubleshooting. 

[Bluieee]

14 hours ago, BeastyB314 said:

Try reseating your ram, sometimes its that simple

i tried doing that , it did not seem to help .
Also tried with single stick and changing slot 

[Bluieee]

13 hours ago, zipspence said:

On this issue in particular I would go for a BIOS upgrade/update for the first route of troubleshooting. 

i upgraded to the latest Bios version and it didnt help , also tried chaning the PCIe options from the bios from (auto ) to (4.0/3.0) and it still the same VGA error

 

[Bdavis]

Will it boot if you put it back to the original configuration it could be an issue with the new SSD.

[Bluieee]

8 minutes ago, Bdavis said:

Will it boot if you put it back to the original configuration it could be an issue with the new SSD.

unfortunly no. 
on the old motherboard no config works (gpu bottom slot , gpu top slot , no drvies , single ram etc ))
on the new motherboard the only config to be working is that if i put the Gpu on hte bottom pcie slot 

[NavyCobra1417]

Which PCIe slot (MSI B550 board) were you using? The top 16x slot (PCI_E1) or the bottom (PCI_E2)?
According to your manual, the bottom slot is disabled when running 2 NVMe drives.

[Bluieee]

On 1/6/2023 at 5:48 PM, NavyCobra1417 said:

Which PCIe slot (MSI B550 board) were you using? The top 16x slot (PCI_E1) or the bottom (PCI_E2)?
According to your manual, the bottom slot is disabled when running 2 NVMe drives.

The top one ofc .yeah i knoew about that already . 
After much testing turn out the CPU was the issue , tried with another CPU and everything is working.
it seems something was wrong specifcly with the CPU and commincation with the top PCIe slot.