No video from only some VGA

[edubencz]

Guys, I need some help...

I have a low end gigabyte motherboard (replaced after my MSI motherboard had the chipset fried), and a AMD 7970.

It all worked fine two days after the MB replacement.

In the third day, I started having no video from the 7970, only the built in motherboard video worked.

I got a borrowed 8400GS from a friend and tested it, and worked perfectly. So I assumed my 7970 finally gave up.

Then I bought a simple GT210 just for using for my movies, online channels etc... (I dont care anymore for pc games, just needed the HDMI port). My sursprise is, the GT 210 is not working either! The same symptom from the 7970! No video... only built in is working...

Does anyone have an idea of what may be happening here? The old 8400GS works, but the 7970 or GT210 does not (absolutely no video(VGA, DVI, HDMI), only built-in video kicks in).

PS. Device Manager shows only the built-in VGA Adapter.

 

[Atomicdonut17]

Are you able to switch between PCIe ports, or do you only have the one?

 

[edubencz]

Are you able to switch between PCIe ports, or do you only have the one?

My low end gigabyte motherboard only have one PCIe 16x, and two litte ones... (1x, I think)

The 8400GS that works does not have HDMI, maybe its only working with older PCIe versions?

The weird thing is that my 7970 stopped working from night to day... I admit fooling around a bit with vga and motherboard drivers in the night before (when all still worked...). But I rebooted twice and all worked fine... In the morning after, no display... =(

 

[Atomicdonut17]

Are you able to switch between PCIe ports, or do you only have the one?

My low end gigabyte motherboard only have one PCIe 16x, and two litte ones... (1x, I think)

The 8400GS that works does not have HDMI, maybe its only working with older PCIe versions?

The weird thing is that my 7970 stopped working from night to day... I admit fooling around a bit with vga and motherboard drivers in the night before (when all still worked...). But I rebooted twice and all worked fine... In the morning after, no display... =(

PCIe is backwards compatible, meaning a 2.0 device will work in a 3.0, vice versa. You're not using any kind of adapters, are you?

 

[edubencz]

PCIe is backwards compatible, meaning a 2.0 device will work in a 3.0, vice versa. You're not using any kind of adapters, are you?

No adapters of anykind...

Any ideas why a 8400GS works and 7970 or GT210 doesnt?

 

[Atomicdonut17]

PCIe is backwards compatible, meaning a 2.0 device will work in a 3.0, vice versa. You're not using any kind of adapters, are you?

No adapters of anykind...

Any ideas why a 8400GS works and 7970 or GT210 doesnt?

I wanted to make absolutely sure it wasn't a PCIe issue, so I wandered through the internet and found their respective release dates. All cards were in production during the "PCIe 2.0 Era", AKA; 3.0 was not widely conceived until 2014, thus no issues with PCIe should be prevalent. For the reason they're not outputting signal, I'm unsure. I'm still looking.

 

[edubencz]

I wanted to make absolutely sure it wasn't a PCIe issue, so I wandered through the internet and found their respective release dates. All cards were in production during the "PCIe 2.0 Era", AKA; 3.0 was not widely conceived until 2014, thus no issues with PCIe should be prevalent. For the reason they're not outputting signal, I'm unsure. I'm still looking.

Thanks for the trouble man...

Maybe a bios update could help?

Altough, it doesnt answer the sudden 'not working anymore' issue...

 

[edubencz]

Motherboard drivers cant be the problem, right? Or else I would at least have any display while in bios screen...

 

[dontlistentome]

Maybe you could try the 210 on the computer of the person you borrowed the 8400 from. Just to verify if those cards work. Another thing is you could install a card, like the 7970, but boot into your bios while using the integrated graphics. In the bios look in the graphics section, to see if the bios detects there is a card in the pci-ex x16 slot.

 

[edubencz]

Guys! Somehow I got this figured out....

What I tried:

Updating motherboard chipset drivers : no effect
Changed bios option for PEG gen 2 : no effect
Disabled integrated graphics (accessing via 8400gs) and rebooting with GT210 with HDMI Port: IT WORKS!

Not only Gt210 worked, I discovered my 7970 is still alive and kicking!

Now... I still have no idea of how all this happened in the first place. Maybe my BIOS is bananas crazy and is simply messing the configurations. I really hope I dont have any more of these kind of problems... =s

Thanks "Atomicdonut17" and "dontlistentome" for your time!