Ok, will try with a 1200W PSU, then I will post the result with it.
Thank you defcon23
you're welcome , thank you to inform me if a decent psu solved your issue,
cheers !
It was the PSU as you said, I have change it with a Corsair RM1000 and the S2 is working now, I will upgrade it with a AX1200i as the RM1000 was connected in 2 S3's.
I hope this info helps some one else.
Best,