Aurora R8, use AIO PC PSU?

Hey I've got a silly question. I've got myself Aurora R8 here with no PSU so I said to myself "Why not just put my old computers power supply in there!?" So then I went.... And now I've found myself in a predicament, I need some help guys, if you could? I have a AIO PSU where all the cables are coming out the back of the PSU, sure you all are familiar, and I've come down the to GPU and realized there is a "GPU PWR" and as well as all connections leading to the front of the GPU...my PSU doesn't have that many GPU power cables!! Do I just scrap the idea or is there a solution? Thanks for your help!!