GPU mine, only 2 cards register

[dakkafex]

So ive build a little rig and i have 4 580's and im using risers, but i just cant seem to figure out how to get more then 2 cards to even show up, if i plug in 3 cards and at card 4 the screen wont even get any signal it seems.

the motherboard i use is an Asus x99 e ws.

any help is much appreciated

[MA3A]

Try adding cards one by one. Read manual for your motherboard, there will be recommendations where goes 1, 2, 3 ,4 cards (order) What os you run? Did you get all drivers installed for your mobo? Updates are done? What kind of PSU, what kind of raisers, etc... too many things left off sight.

[dakkafex]

i have them in the right order, OS is W10, installed all mobo drivers that were on the asus page, im using 2 1000W PSU's, i have updated the BIOS and using these risers https://www.amazon.co.uk/dp/B01JG8UXQW?psc=1

also now for some reason all of a sudden one of 2 GPU's that did work stopped working on full power, the GPU's and PCIe slots are all fined, tested those