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GIGABYTE Radeon HD 7870 Will Not Display/USB Ports Don't Work

I purchased a GIGABYTE Radeon HD 7870 GHz Edition and have not been able to get it to display. I also purchased a Corsair CX600 (600w) PSU so I can run the new card.

Before hardware installation, I uninstalled all of the old card's drivers through device management and Driver Sweeper. Rebooted, and Windows loaded up on the on-board graphics. After fully starting, I then shut down again. I removed the old 300w PSU and AMD Radeon HD 6450. I installed the new PSU and new GPU (Yes I connected the GPU's PCI-E cables). I hit the power button to turn on the computer and it began it's boot order. Everything appeared to be running (hard drive light flashing and all fans running) except there was no display and the usb ports didn't work either. I decided to put the old card back in to see if it would boot and to see if the PSU was working properly. I also double checked all of the cables again. The machine booted fine with the other card in. While the new card was in, I updated my BIOS, then restarted and opened computer setup in the BIOS. I checked to make sure that all of my PCI slots were enabled and they were. I booted normally then shut down. I put in the new card again and received the same problem. At this point I figured the card was bad, so I got a hold of the company and had them send a new one. The new card also does not display or allow my usb ports to be read.

I have read through this forum looking for a solution to my problem but cannot find it. I have been trying to get this card working for almost a week now and still no progress whatsoever.

Computer Specs:
OS: Windows 7 Home
System Manufacturer: Hewlett-Packard
System Model: h8-100z
Bios: Up to date
Motherboard: M3970AM-HP
Processor: AMD FX-6100
RAM: 6GB
DirectX Version: DirectX 11
Current GPU: AMD Radeon HD 6450
New GPU: GIGABYTE Radeon HD 7870 GHz Edition
PSU: Corsair CX600
6 answers Last reply Best Answer
More about gigabyte radeon 7870 display usb ports work
  1. What happens if you run the old GPU on the new PSU?
  2. Did you connect the 12v four pin feed to the motherboard located next to the cpu socket. Sometimes that can be missed when putting a new Psu in.

    If the case plug it in and the system should work fine after that.
    take a look at the link provided showing the location of the 12v four pin to the motherboard bellow. The fault may be down to the motherboard it`s self though and it cannot handle the power the graphics card wants to draw from the pci-e slot of the motherboard. If the case it`s time to buy a new board sorry to say.


    http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c03117539
  3. Someone Somewhere said:
    What happens if you run the old GPU on the new PSU?


    I am currently running the old GPU on the new PSU. It is working just fine.
  4. Shaun o said:
    Did you connect the 12v four pin feed to the motherboard located next to the cpu socket. Sometimes that can be missed when putting a new Psu in.

    If the case plug it in and the system should work fine after that.
    take a look at the link provided showing the location of the 12v four pin to the motherboard bellow. The fault may be down to the motherboard it`s self though and it cannot handle the power the graphics card wants to draw from the pci-e slot of the motherboard.


    http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c03117539



    All of the new PSU's cables are connected properly. The new PSU works fine with my old GPU.
  5. Best answer
    Then I would say the board is at fault.
    If you have the 24 pin ATX connected, and the extra 12v four pin to the motherboard connected.
    And as you say the Pci-e 12v power feeds to the new graphics card.
    The likely prospect is the four pin 12v is not supplying the Pci-e slot it`self with enough voltage to run the 7870 card in it.
    So it would require a new board as said, because the power requirements from a 6450 card to a 7870 are quiet a bit more,from the Pci-e slot it`s self.
    Anyway you often find problems like this with propriety/custom made board`s found in HP systems to fit in the case.
    Or the problem is the spec of the Pci-e slot of the board it`s self.
    I presume it will support Pci-e 1.0 and 2.0 cards. The 7870 Is a third gen Pci-e card supporting 3.0, but it should be able to use 2.0 Pci-e slots also.
  6. Uh? The extra power needed for the 7870 comes from the 2x PCIe 6-pin cables.

    The four pin 12V supplies the CPU.
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