If you can get to windows DDU uninstall all GPU drivers in safe mode minimal.

Are you able to boot into windows fine, but just can't see bios?

Or you can do anything?

Thanks for your reply.

I can boot into Windows and seems work well, just only Bios / Boot Menu can't see anything.

This is a common issue, because it's a UEFI motherboard bios so it requires a UEFI video card with a UEFI video bios supported by the motherboard bios.

I am not sure what video bios is supported by the motherboard bios.

Once windows loads it is supported by the display driver under windows, so it will work under windows.

That's why you get video display output under Windows, and no display output under the BIOS menu. Or a white screen like you have.

It's hard to troubleshoot since I am not aware of any documentation on what UEFI video card models are supported by the motherboard BIOS.

Any luck? I'm in the same boat and looking for a solution.

Hi.me too. I got the same card, runs fine into windows. but white screen bios, I need to set the ram to xmp mode, the defalt is set to 2666. any solutions?

did anyone solved the white screen issues?

the dell r7 250 is UEFI supported, I checked with GPUZ.

Secure boot needs to be disabled, for that you require bios access because it is turned on by default.

Unless you have the original factory video card that came with the system, it's a problem to get this card to work.

I dont have the r7 250, and cant test this for sure myself.

But my guess is that the R7 250 you bought doesnt have a dell compatible uefi vbios. I looked at the various r7 250 vbios's on techpowerup and its hit or miss with some having uefi support and others not. Though all the Dell R7 250 vBios's uploaded there do have uefi support.

If you are willing to take the risk with flashing a vbios yourself you can flash a Dell r7 250 vbios thats uefi compatible. There are a handful of these Dell vbios available on techpowerup:

https://www.techpowerup.com/vgabios/?architecture=Uploads&manufacturer=Dell&model=R7+250&version=&interface=PCI-E&memType=&memSize=2048&since=

Here is a Dell vbios from that list that looks good (uefi YES, and broad mem chip support):

https://www.techpowerup.com/vgabios/181434/181434

To flash an AMD vbios you'll need to look into that yourself, but heres the recommended program:

https://www.techpowerup.com/download/ati-atiflash/

My guess is that once you've given your R7 250 a valid Dell vBios, you'll have no more issues.

NOTE: you'll be flashing at your own risk. you'll want to backup your current vbios so you can reflash just in case you flash a bad vbios you'll want to be able to recover. Eg you'll also need another gpu/igpu you can use.

Edit:

I'd recommend using GPU-z to check your current gpu config before and after flashes

https://www.techpowerup.com/gpuz/

My r7-250 is already the 102 version bios.and Euif supported through Gupz. Still white screen bios

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@jimmy7788 wrote:

My r7-250 is already the 102 version bios.and Euif supported through Gupz. Still white screen bios

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It's related to the (possibly non-standard) Display-Mode (resolution, etc.) being used to display the BIOS,

and the video-cards ability to display said mode over it's HDMI-port (or whatever port you are using). Have you tried all the different kinds of ports on video-card (and/or machine itself) ?

IIRC, in a similar thread, they ran 2 different cables from PC to monitor for a while (monitor auto-detects between them). I think a new BIOS eventually cleared it up.

Also sounds like it also might just be a used-flakey video-card.