Hi and thanks for your reply. I actually got the problem solved now. After I had no ideas anymore and not ANY help from Asus support, I unplugged everything once again, only this time I plugged SSD to the originally emty SATA port. SSD works from there, cd and HDD won't. Have no idea why it's like that, they are all SATA 6g ports. Asus support is waste of time.
Regards,
Tommi