Motherboard PCIe 2.0 Graphic not working

[ekosplatinum]

Well, i know that there is some kind of limitation between this two to technolgies, but i put an rx 460 on this motherboard: https://www.asrock.com/mb/Intel/H81M-VG4/index.es.asp

And after 3 months of some errors the card stop working, so i decided to sell it. meanwhile i buy a GT 710 to play some games and after 5 months everything its fine. Now i buy an RX 550 and start to do the same things that the rx 460 did it like need to reinsert the graphic in the PCIe slot when i turn the pc on. Is there some compatibility mistake or is just my motherboard (i test the graphic card on other pc and it works).

My PC specs:

I5 4460 3.2 GHz
Asrock H81M-VG4 rev2.02
Sapphire Rx 550 2GB
Evga 600W 80 plus
4GB RAM DDR3 1666MHz


Sorry for long question

 

[bfcallan]

I would try updating the bios.