Im building a budget system from used parts, I have an i5 3470, and an mq77dk motherboard ive purchased off of ebay.
The system works the odd thing is I plug an old rx 250 (single slot low power card) works fine the board see it video initializes everything is golden
I plug in an Asus 750ti strix card works all is gold
i plug in an rx480 nothing bios shows the slot as unpopulated and only onboard video will work.
the rx480 works fine, in fact im using it on the machine im typing this post on.
The only thing i can think of is maybe the power draw is too high. there is literally nothing available on google and im at my wits end on this.