So, finally today i received the control ICs. So i soldered that one in place, also re-used the old FETs, since they at least passed the switch test.
But no go.
Nothing bad happened though, (as in exploding), the cpu fan turns on, and nothing more. I was giving up, but just for a quickie i hooked my scope up, and i could see signals on all pins on the second FET, (the one furthest from the cpu), and signals on Gate and drain on the first one, but a total flat-line on the source.
What could this indicate? Now, it was just a super quick check, so didnt take note on the levels or frequency, but if that might help i can hook it up once more.