Don't Worry! EVEN I HAD THE SAME ISSUE WITH THE SAME CARD.
The thing is, first go to your BIOS and set the init video first to PCI-e (There should be 3 options Onboard, PCI, PCI-e, SELECT PCI-e). This would ensure that your card is used instead of your motherboard.
Next, download the latest drivers. Or if you want windows to do stuff, open device manager (right click computer and click manage. In that from left panel select device manager). Unlock display adapters and right click on the standard vga monitor (or whichever comes on the drop down list) and click update driver software.
Please try this before buying a new motherboard. If it works then great!
I forgot to mention. Before you do that BIOS thing, run your PC using the video connection onboard (from the mobo). Then select the init display first to pci-e and then turn off, install card, connect it, and switch it on. That should detect it.