"I tried re-installing the cpu, removing all gpus and connections into the back of the PSU and unplugging one of the ram sticks. Nothing"

Not entirely sure about what you mean with removing gpus (did you try to boot without).
But here's what I would do.

Remove all GPU's, Keep 1 memory stick in #1 slot. Remove all eventual USB things you have connected.
Does it boot?
Add the second memory and try again.
Does it boot?
Add 1 graphic card and try again.


If it doesn't boot, make sure everything is correctly connected. (Use motherboard handbook).
If everything is connected correctly try this with 1 GPU in the main slot and both memory sticks.

Find the CLEAR CMOS jumper on your motherboard. (Use handbook for ref.)
Normally it is 2-3 pins sticking up that you have to (shortcircuit? dont know the english word.)
by either using a key or some metal piece so that the two pins get currency between them.
On most new motherboards there are a little piece of plastic with metal inside them sitting on 2 of the 3 pins.

Like [ .  . ] .
Then move it so it is . [ . . ]
Powered off and PSU disconnected.
Then move it back again.

I had the same problem with cpu fan not running and stuff when I tried to overclock once so.
Give it a try.

Bump.
I've been looking some. 280x seems to be a very popular card, however very hard to get hands on.

I've done some search and it seems that 7990 is (about) 2x 7970s?

I've found 7970s second hand for about 120-200USD each.
7990 would be around 600usd.

Since I can get 4 7970s for rougly 800USD i might consider doing a separate mining rig instead.


What about 270x / 290?
Any suggestions?

Hey.
I'm thinking of upgrading my computer so i can also use it for mining.
What would be the best setup?
Budget 1200USD.

Considering 1 card or 2 cards.

Current setup:

Asrock z77 pro4
i3570k
8gb ram
128gb ssd
GTX 660
550W Corsair PSU.

Thanks in advance.