gabolton
Wild guess here but a 650w PSU isn't going to cut it.
 
Personally, I wouldn't go with anything less than a top tier 850w PSU and would likely opt for a 1000w.

Necrophyte
Yes, 650W really isn't enough. I'm running mine fine on a 850W G5. But even on the Video cards specs, EVGA recommends a min of 750W.
On Paper the NZXT H1 looks ok (Was looking at the specs) But not sure how you connected it. There is only 2 VGA connectors and 1 CPU (Sorry going off image).
Do you have it running an 8 Pin PCIE and an 8 + 8 Pin PCIE? This is fine if you are, I am doing the same thing. Might not be fine if you are running it as SATA connector running to 8 PIN PCIE.
Sorry if these seem off questions just trying to help exhaust all options. 
650W Should be enough for it to turn on though. Just maybe not when running 100% load.
To give you an idea, Just the CPU and GPU are running at 475W alone. Not including anything else you have running. Cooler, M.2, MB, HDDs, Case fans. All add up. 

browe1891

Sajin
Is your bios fully up to date? Try another pci-e slot if available. Try all the outputs on the gpu. Make sure your monitor is set to the correct source.

i updated my bios a few months ago so its not super old...I cant try another slot since is only a 1 slot motherboard. 
 
I tried all the outputs and still nothing. It powers up though and fans spin for a bit

Wyn10

gabolton
Honestly, I'd go buy a new quality PSU. A minimum of 850w so it'll have 3x separate PCIE cables and use those to connect to your 3090.
 
@Wyn10 How old is your PSU? How do you have it connected to the 3090? Not positive on this but you might want to check the PSU thread.
 
If I recall correctly the G2 was one of the PSU's that people had issues with trying to power a 30xx card.

Using a Supernova 850 G2 thats 4 years old, 6+2 cables, nothing daisy chained.  Kinda weird that's the issue when Sli 1080s are fine.
 
My PSU is on the list in that topic.


Edit: I just put the 3090 in and set the primary graphics adapter to onboard in bios and windows doesn't even detect the 3090 in device manager. With 3090 as primary windows doesn't even load, detecting this with my ram rgb not changing settings when windows should be booting.

After a month and a half of waitin this blows lol.

Wyn10

browe1891

Wyn10

gabolton
Honestly, I'd go buy a new quality PSU. A minimum of 850w so it'll have 3x separate PCIE cables and use those to connect to your 3090.

@Wyn10 How old is your PSU? How do you have it connected to the 3090? Not positive on this but you might want to check the PSU thread.

If I recall correctly the G2 was one of the PSU's that people had issues with trying to power a 30xx card.

Using a Supernova 850 G2 thats 4 years old, 6+2 cables, nothing daisy chained.  Kinda weird that's the issue when Sli 1080s are fine.

My PSU is on the list in that topic.


Edit: I just put the 3090 in and set the primary graphics adapter to onboard in bios and windows doesn't even detect the 3090 in device manager. With 3090 as primary windows doesn't even load, detecting this with my ram rgb not changing settings when windows should be booting.

After a month and a half of waitin this blows lol.

oh man i feel for you, let me know if you find a resolution. I find it hard to believe that the 3090 is bad out of bock. Could be something with my motherboard but i really have exhausted all options

Waiting on support ticket hoping for a miracle fix otherwise rma'ing.

browe1891
UPDATE!!! GOT IT WORKING... I thought it wasnt a bios issue since I just updated it a few months back...welp turns out I installed the lastest bios (released back in july) and it worked no problem! 
 
I was just going to RMA it but I took a last effort and installed in into my GF's PC and it worked on hers...hope this helps someone out
 
Moral of the story: UPDATE YOUR BIOS

thomasdadams
How did you update the bios if no display? I don’t have another gpu and the screen won’t work.

richcz3
Running an EVGA 1000W G2 PSU and Im getting no signal on my monitor
3 separate leads from the PSU to the card
Ive been running this setup since December 2020 and last night the signal cut off while playing Bioshock Remastered. Hardly a system taxing title for a card like this.
 
I put my RTX Super 2080 back in and its working fine.