Mobo cant detect HD 7750

[hulk111]

Hi, my question is to how could my mobo detect my gpu instead my onboard one.

I switched my mobo from Asrock n68-vs3 to an Asus M4A79T Deluxe. On the old mobo the 7750 got detected without any problem but in the new one it only sees the onboard (microsoft) gpu. I went to the BIOS (american megatrends, latest update) but i didnt see an option there that would help detect the external gpu first.
Here is the manual of the mobo: https://www.manualowl.com/m/Asus/M4A79T-Deluxe/Manual/264257?page=80

UPDATE: I dont get it, I just updated the onboard graphics card to the latest and now shows hd 7700 series in the device manager wtih latest update.

Thanks

 

[Alec Lockhart]

Also, do you have your video cables connected to the GPU? Did you install a fresh version of your OS when you upgraded Mobos? That is a MUST when upgrading / changing a Mobo. Try that, reinstall all the drivers both for the GPU and the Mobo and try then. That should work. If not, try another PCIx16 slot.

Otherwise, it is your GPU.

Another test you could do is test another GPU, just some random, low-powered GPU.

 

[hulk111]

Honestly I skipped the reinstall part because everything works fine.
It turns out the new mobo didnt like the gpu driver when i first booted the system. Now I deleted all the drivers and reinstalled the gpu driver i prefer. The detection is a no issue anymore but the driver I installed works only perfectly in windows 7 not in windows 10. In windows 10 the videos and everything seems less detailed, sharp and a bit blurry.
Im using the same driver in both systems so i dont get it.

 

[Alec Lockhart]

I know it might SEEM fine but it is always a good idea (especially when changing Mobo brands) to reinstall your OS. You don't have to but it is a really good idea to. Reinstalling the OS can help re-pair the OS to the motherboard and prevent further problems.

Beware, your key that comes with the OS is bound to your motherboard. At some time your OS might not recognize your motherboard and force you to get a new key. If you ignore this the copy of your OS will become non-genuine.

Just a warning, do what you like!

 

[hulk111]

Yeah thanks for reminding me for the OS activation thing with new hardver i totally forgot about that. If the new mobo causing the driver issues i will probably reinstall the OS.

 

[Alec Lockhart]

Yeah thanks for reminding me for the OS activation thing with new hardver i totally forgot about that. If the new mobo causing the driver issues i will probably reinstall the OS.

Yeah, I have made the mistake of changing my motherboard and reinstalling my OS without a new OS key. I did not like running with a non-genuine Windows while I waited for a new key...