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PC not detecting ASUS Radeon HD 7770 Graphics Card

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  • Asus
  • Graphics Cards
  • HD
  • Radeon
  • Graphics
Last response: in Graphics Cards
April 15, 2013 10:09:55 AM

My PC does not detect my graphics card at all. It's the Asus Radeon HD7770-2GD5. Here's some other specs of my recent PC build.

Motherboard = Asus F2A85-M
PSU = Ultra 700W
RAM = Corsair Vengence 16GB (4x4096)
CPU = AMD Quad Core A10-5800K (Has Thermaltake CLW0215 Water 2.0 Performer CPU Liquid Cooler on it)

Graphics card is in there nice and tight and connected to a VisionTek 450W dedicated graphics power supply unit. Green LED is lit up on the graphics card. Went into BIOS and made PCIE / PCI the default graphics display. But as far as my PC is concerned, it doesn't exist at all. With my motherboard, I have an integrated Radeon HD 7660 with 2 GB of memory (which is better then I realized when I bought the card) and a GPU boost from my CPU so it's no big loss. It's just driving me absolutely nuts that my graphics card simply doesn't exist. Could it be the dedicated graphics power supply unit? Thoughts?

More about : detecting asus radeon 7770 graphics card

a b Ĉ ASUS
a c 155 U Graphics card
April 15, 2013 10:30:03 AM

your CPU has the dedicated graphics... it's an AMD APU... which is a dual CPU/GPU unit. The 2gb of dedicated vram are from your system ram... nothing on the mb at all.

in the bios set your primary GPU to PCI-E, then make sure your monitor is plugged into the GPU, not the MB, turn the system back on and let us know what happened.
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April 15, 2013 10:53:47 AM

Thanks but I tried that already and nothing. Case has the clear siding and I can see the Green LED is lit on the graphics card but the monitor flickers between Analog, Digital and HDMI looking for a signal, then eventually just pops up the message that there is no signal.
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a b Ĉ ASUS
a c 155 U Graphics card
April 15, 2013 11:09:20 AM

Scootulu said:
Thanks but I tried that already and nothing. Case has the clear siding and I can see the Green LED is lit on the graphics card but the monitor flickers between Analog, Digital and HDMI looking for a signal, then eventually just pops up the message that there is no signal.



  • is the fan running on the gpu? It takes almost no power to power an LED. a fan is a different story.
  • are you certain the video cable works?
  • finally is the psu plugged into the gpu properly?


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    April 15, 2013 11:29:53 AM


    And yes the PSU is plugged into the GPU properly and the GPU is in the PCI-E slot properly and tightly. And I'm very sure the cable is working because it's currently plugged into the MB graphics port and running perfectly.

    Fan......Hmmmm. Good point. If there's nothing, I'll unplug my GPU from the dedicated graphics power supply unit and into the main PSU. Then I'll advise what's what.

    And thanks for all the help. It's been awhile since I've done a complete, custom PC build from scratch so I'm a little rusty. :-)
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    Best solution

    a b Ĉ ASUS
    a c 115 U Graphics card
    April 15, 2013 12:03:36 PM

    Scootulu said:


    Fan......Hmmmm. Good point. If there's nothing, I'll unplug my GPU from the dedicated graphics power supply unit and into the main PSU. Then I'll advise what's what.

    Wait...what?? You mean you are using a dedicated PSU?
    That almost never works as expected. The components usually rely on the power connections to have bridged grounds.

    In rare cases it can even cause components to fry.

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    April 15, 2013 12:56:35 PM

    LOL. Yeah, I'll definitely check that dedicated PSU then. I guess customer reviews aren't all their cracked up to be.
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    April 15, 2013 7:47:44 PM

    Ingtar33, Smeezekitty, thank you very much for the help, the problem is now resolved. The fans on the card were running so it was getting the necessary juice, but I unplugged the dedicated PSU and plugged in the main PSU and voila, one driver update later, we're up and running.
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    a b Ĉ ASUS
    a c 115 U Graphics card
    April 15, 2013 8:28:44 PM

    Basically the motherboard has + and - voltage from the main PSU and the video card was also getting + and - from the external PSU.

    The problem arises because the PCI-E signals are referenced against negative. But the negative feeding the video card was not equal to the negative of the motherboard so the signals weren't getting through.

    Hard to explain.
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    April 16, 2013 10:34:14 AM

    smeezekitty said:
    Basically the motherboard has + and - voltage from the main PSU and the video card was also getting + and - from the external PSU.

    The problem arises because the PCI-E signals are referenced against negative. But the negative feeding the video card was not equal to the negative of the motherboard so the signals weren't getting through.

    Hard to explain.


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    April 16, 2013 10:36:16 AM

    Though I never understood electricity very well, I think I get it. Kind of like trying to punch someone under water. You think of it, do the motion, make contact, but don't get much of a result.
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