just

Thanks to everyone for helping, I replaced the 4790T with a 4770T and everything is working fine now.

Ok thanks I'll try a 4770T then, not looking forward to having to do the heat pipes and paste for the third time though.

Thanks for the info but I was under the impression that the 4790T was compatible with the DH87RL as they are the components that Hifidelit Computer Audio use in some of there Music Servers and HTPC's Streacom I7 4790T HTPC Silver

Thanks thing is its the second Pico i've tried also tried a full size atx supply with same results

Been trying to build a CAPS like music server but cannot get this thing to boot up. I've gone through two DH87RL motherboards as I suspected the first was faulty. Other components are a i7 4790T CPU, 2 x 8GB Crucial Ballistix Sport DIMMs a PicoPSU-160-XT PSU with a 120W 10A 12V AC Adapter in a Streacom FC5OD case. Also tried 150W 12.5A Adapter but the thing just wont boot. I get the green standby led illuminated on the motherboard and the Power Button led illuminates and stays on when pressed on the case but no Video signal or motherboard beeping, It just wont turn on. Any help would be greatly appreciated, i've been trying to get this up and running for three weekends now feeling pretty gutted.