I tried to wire it as in the OP, molex splitter, two yellow cables going to the + of the blade and four black to the -. I always considered myself somewhat sloppy when it comes to dealing with hardware, it is possible i have messed it up with screwing? there are 4 of these screws on the connecter, what should be their position?
Facing the screws, the two left screws are GND, the two right screws are +12V
You don't need to connect all 4 terminals, you can use only one of each (as long as you have enough wires for 10A per Blade)
This PSU should be enough for up to 4 Blades
Btw status CHIP:OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO is displayed even if not hashing?
Yes. I don't know what's wrong if not the PSU. All the doc I've seen mentions either a faulty PSU or something awful when you only get x's instead of O's and it persists over cold restarts. Are you sure that they were OK in the first place?