2x R9 295x2 + AX1500 = Instant power off...?

Hi all, I'm new to the forum and am need of desperate help!



I built a new 4k gaming PC, but can't seem to use my cards...



I've tried to follow this:



http://ift.tt/1jvMBpp



But not having any luck...



I understand theres 2 cables for Corsair Link, I only have 1 connected (mini USB -> USB port on Motherboard) and perhaps thats the issue, but I can't work out where the digital cable goes...



I'm desperate to get gaming @ 4k any help is appreciated...



PS: Wasn't sure if this is a PSU issue or Link issue. If placed in the wrong place apologies.