9/10 of not detecting is because the card is not fully sat down correctly so...
1,,,,take card out and check there are no bent pins and give them a quick clean with a tissue and alcohol
2... check your pci slot just to make sure that it is clear and nothing has become stuck
3.... insert card back in making sure that your release tab comes back up and it is level all the way across
4....plug power back in and boot up
5.... hopefully it should have been detected ... check under device manager
goodluck
It still isn't being detected unfortunately.