Question PC will not boot up when GPU is plugged in after upgrading everything inside

[DanTheMan20017]

Hi guys!

I’m really struggling with my newly upgraded gaming PC and I was really hoping someone could help me find the problem. I have replaced the motherboard, GPU, CPU, RAM and power supply and have added a cpu cooler too. The problem is that when I install and plug in my 3080ti founders edition, the computer does not want to start at all and just flickers the RGB lights. But when I remove the graphics card and run it only on the integrated graphics, it works ok! After that, I swapped back and put my old graphics card back in and then it started and booted no problem. I then put my old motherboard and components just out on the box and put the 3080 and using the old 600w psu on there to see if it worked and it started fine! So now I know the graphics card is working fine. I’ve also swapped my PSU back to the old one (600w) to see if it was a PSU issue and it just does the same thing pretty much. Also, for some reason I now have to hold the power button for the computer to start which is odd because it never used to do that with the old components.

Anyone got any ideas from here? Thank you!

 

[rgd1101]

full system spec? include brand and model of the psu

 

[DanTheMan20017]

full system spec? include brand and model of the psu

Motherboard - ASUS TUF gaming X670e plus
GPU - 3080ti founders edition
CPU - ryzen 9 7950x3d
RAM - Corsair vengeance DDR5 2x32gb
PSU - Corsair RM1000e

 

[Gaidax]

You don't by chance use a single daisy-chained 8 pin power cable to power that 3080Ti?

 

[DanTheMan20017]

You don't by chance use a single daisy-chained 8 pin power cable to power that 3080Ti?

No, I have tried 2 other cables to make sure the cable wasn’t the issue

 

[boju]

What was the old psu and does that have modular pcie power cables you might've reused attaching those to the Corsair psu? Also what is the old gpu, did that require pcie power cables?

Weird that old psu works with the 3080 but new psu doesn't. With that im wondering if you've mixed psu cables. If you did then Corsair is detecting a short and preventing the system from turning on. Only use cables the psu comes with, even if they look and fit the same, pinouts often change and you risk frying components.

 

[DanTheMan20017]

What was the old psu and does that have modular pcie power cables you might've reused attaching those to the Corsair psu? Also what is the old gpu, did that require pcie power cables?

Weird that old psu works with the 3080 but new psu doesn't. With that im wondering if you've mixed psu cables. If you did then Corsair is detecting a short and preventing the system from turning on. Only use cables the psu comes with, even if they look and fit the same, pinouts often change and you risk frying components.

The old PSU has cables connected inside it which you cannot remove and the new PSU I have only used the cables that came with it. Do you think it could be a motherboard issue? The motherboard is from Amazon used but excellent condition apparently

 

[boju]

The old PSU has cables connected inside it which you cannot remove and the new PSU I have only used the cables that came with it. Do you think it could be a motherboard issue? The motherboard is from Amazon used but excellent condition apparently

What was your previous graphics card?

If the other card worked there's no reason why 3080 won't.

Could mess around with pcie gen for pcie slot, instead of auto try pcie 4 - in Bios. The graphics card is installed directly to the pcie slot? No riser extender cable to orientate gpu differently? Sometimes these have issues with pcie gen.

 

[DanTheMan20017]

What was your previous graphics card?

If the other card worked there's no reason why 3080 won't.

Could mess around with pcie gen for pcie slot, instead of auto try pcie 4 - in Bios. The graphics card is installed directly to the pcie slot? No riser extender cable to orientate gpu differently? Sometimes these have issues with pcie gen.

My previous card was a 2060

I think my next step would be to set up my old motherboard like I did before and put the new graphics card in it along with my new PSU to see if it’s the power supply that’s faulty. If not then surely it would be the motherboard that’s faulty?

And no, the graphics card is horizontal like standard with no brackets or anything

 

[boju]

The new psu powers 2060 fine on new motherboard and 3080 has been confirmed working on your old board and old psu, according to op.

Try changing pcie gen to 4 instead of auto on new board using the 2060 then change to the 3080.

 

[DanTheMan20017]

The new psu powers 2060 fine on new motherboard and 3080 has been confirmed working on your old board and old psu, according to op.

Try changing pcie gen to 4 instead of auto on new board using the 2060 then change to the 3080.

Just tried, still doesn’t start and only flickers with the new gpu in after setting it to gen4

 

[DRagor]

2060 requires one 8 pin cable while 3080 need two, right? So if 2060 works and 3080 will not start to me it is clearly that one of the cables of new PSU is faulty.

 

[faalin]

I swear, jayztwocents had a video about this a while back. He had a 3080 that would not give video on a certain motherboard and had to do a Vbios update for it to work. I couldnt find it but found a EVGA froum page talking about it.

First off i would get a new PSU, The 2000 and 3000 series cards have very bad power spikes that will trip the over current protection on the PSU. 1000w if your using an older ATX2.0 850w if you get a newer ATX 3.0, i moved to from a 850w EVGA G2 to a 1600w EVGA G2 on my 2080 Ti. Next read through this EVGA Forum page "To ensure compatibility with certain UEFI SBIOSes, an update to the NVIDIA GPU firmware may be required."

 

[DanTheMan20017]

2060 requires one 8 pin cable while 3080 need two, right? So if 2060 works and 3080 will not start to me it is clearly that one of the cables of new PSU is faulty.

I have tried multiple cables for the 3080 and have also put the 3080 and 1000w psu on my old motherboard, which started up no problem so surely the problem cannot be the PSU or the GPU?

 

[DRagor]

I have tried multiple cables for the 3080 and have also put the 3080 and 1000w psu on my old motherboard, which started up no problem so surely the problem cannot be the PSU or the GPU?

I suppose 1000W comes with 3 cables so if only one is bad you could still happen to connect 2 good when using old motherboard, don't you think? It is not that much work to check all cable combinations.

Since 2060 works on new motherboard I don't see an option for motherboard to be bad in regard to PCIe slot. Worst it could happen would be 3080 is not recognized, but you say it won't boot at all. To me only possible way it could happen is a problem with power connection.

 

[boju]

Just tried, still doesn’t start and only flickers with the new gpu in after setting it to gen4

Try gen 3 next.

https://forums.evga.com/m/tm.aspx?m=3578792&p=1

 

[DanTheMan20017]

Try gen 3 next.

https://forums.evga.com/m/tm.aspx?m=3578792&p=1

Update!! I’ve got the computer running and all fine! HOWEVER it only runs when the case fans hub/controller box thing is unplugged?? Now I’m lost again.

As soon as I plug in my cyberpower led fan controller box to the singular molar cable from the PSU, the system flickers and does not start at all like before. This means I can only run the computer when the stock fans (not the cpu fans) are disconnected and not running

To add to the confusion, if I connect my fan controller but disconnect my gpu, the pc starts up so the fan hub is surely working fine?