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Just installing my new 7900xt .. not posting

thefunkygibbon

thefunkygibbon

thefunkygibbon

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Joined
8 Nov 2002
Posts
160
Just taken delivery of my lovely new sapphire 7900xt and have installed it but I'm getting zero display :-(
Fans are spinning. Vga error light comes on on the board and disappears after about 10 seconds much the same as it does with my old rtx3070 which I just took out.
Put the old card back in and it works fine.. see bios post screen fine. Swapped cards a bunch of times and just can't get anything on it.


Mobo bios (msi tomahawk am4) has been updated as of last week in prep for this and the new cpu coming later today. (5700x ... currently is a 3600). Tried different hdmi ports and cables. Don't have displayport screen to test on...but presumably the card wouldn't default to those.

Any advice please as it's doing my head in. I hate having to send something back as I always fear they will test it and find it working fine and charge me a bunch.

Thanks in advance for anything you can suggest.
 
Check the extra power cables are properly connected. Make sure it is 2x dedicated 8pin connectors, not via splitters.
What PSU do you have? 7900XT is 300W TDP compared to 220W on the RTX 3070, so it needs more power.
 
Thank you for your replies!
I'll try resetting bios when I get home (rage quit and went to a restaurant for dinner with family). I was reluctant as I had to go through everything to re set it back up after upgrading bios last week.

I don't recall seeing a gen3 option in thrre though. Wouldn't the 3070 be that?
Psu is 750w corsair. I'll try unplugging a couple of hdd's to see if that frees up some watts.

The connectors are 2x 6+2 cables from the psu is that OK? Not splitters.. I'm using them plugged in from each rail like I did with the 3070.
 
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thefunkygibbon said:
Thank you for your replies!
I'll try resetting bios when I get home (rage quit and went to a restaurant for dinner with family). I was reluctant as I had to go through everything to re set it back up after upgrading bios last week.

I don't recall seeing a gen3 option in thrre though. Wouldn't the 3070 be that?
Psu is 750w corsair. I'll try unplugging a couple of hdd's to see if that frees up some watts.

The connectors are 2x 6+2 cables from the psu is that OK? Not splitters.. I'm using them plugged in from each rail like I did with the 3070.
Click to expand...
save your bios profile
before setting the defaults
 
I dont think I'm overclocking. I'm searching through my emails for any reference of buying it and can't find what model it is etc right now. Might have to hope that it says on the unit what it is
 
did you uninstall the nvidia drivers first?
been a very long time since i switched from nvidia to amd
so not sure if its necessary or not
but cant hurt if you didnt
 
quite possibly not
but was one of the easier things to check first
can you manually select input on your monitor?
only had 1 gpu that didnt automatically pick up the right input
but again easy thing to test

able to test the new card in a friends pc?
 
yeah i realise you dont have display port
i meant does your monitor have more than 1 input?
even if its something like 2 x hdmi?
if so look for buttons/joystick on the monitor
that allow selecting hdmi 1 or hdmi 2 etc
 
I was connecting via my avr.
Just installed drivers and it is showing it as a 2nd screen now I've plugged the card into my avr via hdmi as secondary. But boot up it seems to only want to output to hdmi
 
well at least we now know the card works :)
yeah i have had it before my card would only boot to hdmi
then i had to manually select displayport on the monitor
so we didnt know about the avr to start with
would have been a useful bit of info lol
 
did you have fast/ultra fast boot enabled in the bios?
edit
from windows
go to recovery setting then advanced startup
that will restart with options including enter bios/uefi
look for fast boot option and turn it off
then when pc is starting you should have enough time to hit del key
or whichever key it is for msi board to enter bios
 
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