I have a sapphire hd 7790 dual-x oc version that won't show anything on screen but detected on device manager, though ccc not recognizing it. The fans are spinning. The vga shows nothing on monitor since boot(post) until to desktop, but when i plugged in to onboard graphics(intel hd 2500) it shows nothing on post, but then it show the windows login screen and then everything works fine. Still, when i put the cable back back to the discrete gpu, it shows nothing but black screen. How to fix that? I believe that gpu is still working but got some error. Thanks!
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