so after trying a couple of different fans and reading the logs, you guys were 100% right, it was faulty fans - 2 of them to be exact. Luckily I had a spare L3 that wasn't working, so I used the fans from that rig and it seems to be working fine now with get 4 and get 5 - two fans operating and it began to hash. So thank you guys not only for solving the issue, but for teaching me a bit about how to read the logs!