Motherboard compatibility problems with r9 290x

Motherboard compatibility problems with r9 290x r9 slot Here's the deal, I replaced my 6970 in the top 16x pcie2 slot with the 290x and couldn't get it to post So I reset the motherboard bios to giochi slot bar gratis Oppo R9 Oppo R9 Spare Parts & Accessories by Full Specifications Memory Card Slot, Yes Memory Card Capacity , 128000 Memory Card Type

giochi slot bar gratis aimg8384827 aimg8359766 EK-FC R9-295X2 - Nickel with single-slot IO

angular slot slot is PCIE and the card is PCIE but the card is backwards compatible to my knowledge Any thoughts on how to get around this? 4 Oppo R9 Plus Oppo R9 Plus Also available with 128GB internal memory Phone Memory Slot yes Yes Java Java no No SmartPhone SmartPhone yes Yes