Question Pc wont post with display port plugged into GPU but works fine in mobo

[DanAnderson95]

Please help! Just bought new b650 am5 mobo,7700x, dddr5 ram and gen 4 m.2 SSD to go with existing 3090, PSU etc.
Pc posts as normal (apart from not recognising old sata m.2 ssd) with display port cable in mobo. As soon as I stick it in the GPU I get no display and have to force shutdown the pc as when swapping it back to mobo port nothing happens. Pc detects 3090 and have installed drivers in windows. If I try to start pc with display port in GPU it doesn't post... Or maybe it does but I can't see. Tried hdmi as well. Thanks for your help

 

[COLGeek]

What is the make/model of your PSU and do you have both the 24-pin and 8-pin power connectors firmly attached to both the motherboard sockets and the PSU itself?

 

[DanAnderson95]

What is the make/model of your PSU and do you have both the 24-pin and 8-pin power connectors firmly attached to both the motherboard sockets and the PSU itself?

Thanks for your reply. It's a ROG 1000w I've been using for a year. Yes all connections have been checked.

 

[COLGeek]

Using the onboard video, try updating your motherboard BIOS (if not already the most current version).

If already the most current version, perform a hard reset if the BIOS and try again with the 3090. Steps:

Power system down
Remove all power connections (power cable, display, powered speakers, etc.
Remove the motherboard battery
Press the power button to discharge any residual power in your components (yep, I'm serious)
Wait a minute or two
Reverse the steps..battery..connections.
Power on.

 

[DanAnderson95]

Using the onboard video, try updating your motherboard BIOS (if not already the most current version).

If already the most current version, perform a hard reset if the BIOS and try again with the 3090. Steps:

Power system down
Remove all power connections (power cable, display, powered speakers, etc.
Remove the motherboard battery
Press the power button to discharge any residual power in your components (yep, I'm serious)
Wait a minute or two
Reverse the steps..battery..connections.
Power on.

I have tried this already. Wouldn't post at all to start with so had to do a usb flashback with the latest stable bios and then have cleared CMOS a few times since during trouble shooting process

 

[COLGeek]

If you physically remove the 3090 altogether, does the system seem to work properly otherwise?

What is the make/model of your motherboard?

 

[DanAnderson95]

If you physically remove the 3090 altogether, does the system seem to work properly otherwise?

What is the make/model of your motherboard?

Yes all seems to work other than old m.2 sata SSD can't be found although I've read online that I may need to swap to CMS first which I can't do without a gpu working. Mobo is b650 mag tomahawk WiFi from MSI.

 

[COLGeek]

Does the BIOS not detect the SSD? Which M.2 socket is that SSD installed in?

 

[DanAnderson95]

Does the BIOS not detect the SSD? Which M.2 socket is that SSD installed in?

Yeah bios can't see it I've tried both the lower ones my new drive is in the top one and is detected but it's a gen 4 pcie drive not sata like the old one

 

[COLGeek]

Yeah bios can't see it I've tried both the lower ones my new drive is in the top one and is detected but it's a gen 4 pcie drive not sata like the old one

Take a look at the motherboard manual. You have 3 m.2 sockets. Is the SATA SSD in M2_2 or M2_3?

If M2_2, try moving to M2_3.

https://download.msi.com/archive/mnu_exe/mb/MAGB650TOMAHAWKWIFI.pdf

 

[DanAnderson95]

I have tried both but no change I believe once I get the GPU working I will be able to find it with legacy settings.

 

[COLGeek]

Earlier, we mentioned 8-pin and 24-pin power connectors, are both 8-pin connectors attached?

 

[DanAnderson95]

Earlier, we mentioned 8-pin and 24-pin power connectors, are both 8-pin connectors attached?

Yes 2 8 pin CPU and 3 pcie 8 pins to the Gpu

 

[COLGeek]

The 3090 in the PCIe x16 slot closest to the CPU?

 

[DanAnderson95]

The 3090 in the PCIe x16 slot closest to the CPU?

I have tried both but currently yes. I do apologise but I have to be up i a couple hours for work. Unfortunately I will have to continue this tomorrow. Many thanks for your help so far. Any I ideas you have I will be happy to try tomorrow evening.

 

[COLGeek]

Understood. We have ruled out all the common things.

 

[COLGeek]

Have you tried without the SATA SSD installed at all?

 

[COLGeek]

I asked the moderation team for ideas. The super talented @Ralston18 suggested trying a different DisplayPort cable and I'll add port (as your GPU should have several).

 

[DanAnderson95]

At work now brainstorming so not able to change things but yes I did try without the SSD andI have tried different cables and monitors including hdmi with the same issue. Is it worth me getting different ram or CPU today or is that unlikely to be the cause?

 

[DanAnderson95]

Have now resolved the issue. Thank you for your help. Turns out my new barrow CPU waterblock had come with am3 springs (significantly shorter than am4/5) so I had inadvertently overtightened the cooler.

 

[COLGeek]

How the heck did you figure that out?

 

[DanAnderson95]

Was going through the rubbish and found the little bag for the springs and thumbscrews and it said am3 on it. Pure luck really I was out of ideas.

 

[COLGeek]

Was going through the rubbish and found the little bag for the springs and thumbscrews and it said am3 on it. Pure luck really I was out of ideas.

That was fortuitous. Lucky outcome.

 

[Darkbreeze]

And while you did get this figured out, which, congrats, one thing that was not mentioned here from what I saw is that sometimes you have to actually SET the input type on your monitor. So, some will automatically default to HDMI and you have to manually set the input to displayport or you simply won't get anything on screen at all. Not as common these days but still happens with some display models.