Hello,i used asrock alivenf7 fullhd vr3.0 with a HIS 2600xt for almost 2 years until a few days ago when my mobo didnt recognized my card anymore, so i tryed it on another PC and it works, i also tryed a 7300gt on mobo and it works , i also reseted the MB bios and it still didnt recognized my ATI card ,so please help me out if you have a solution.
The only way what you say makes sense is if you have a loose connection.
Any PCIe graphics card should work on any motherboard.
I don't know what else to tell you. I assume when you say "not recognized" you mean that there is absolutely no video from the card even when Restarting.
If you do see any video (so you can enter BIOS) then your video card works fine and it's a Windows software issue.
Otherwise you either have an intermittent graphics card or motherboard issue, possibly a loose connection or a crack.