Powering Up Problems

I'm building my first HTPC. Everything was installed and connected. No MB power, but get the LED light. Checked everything and still no MB power. To diagnose the problem I began disconnecting devices. I got to the HDs. I disconnected the SS drive and no power. I disconnect the WD and POWER. That is with no HD connected. I connect just the WD, no power. I connect just the SS POWER. So with the SS connected, every time i try to connect the WD I lose power. Why can I not connect both the HD? Am I missing something or do I have a bad WD HD? Estimated total system draw is 134W.

System Components:
CPU - Intel Core i3-4130T 2.9GHz Dual-Core Processor
CPU Cooler - Scythe BIG Shuriken 2 Rev. B 45.5 CFM Sleeve Bearing
Motherboard - Asus H97M-PLUS Micro ATX LGA1150
Memory - Kingston Fury Series 8GB (1 x 8GB) DDR3-1600
Hard Drive #1 - Samsung 840 EVO 120GB 2.5" Solid State
Hard Drive #2 - Western Digital Caviar Green 3TB 3.5" 5400RPM Internal
Case - Silverstone GD06B HTPC
Power Supply - SeaSonic 360W 80+ Gold Certified ATX
Optical Drive - LG WH14NS40 Blu-Ray/DVD/CD Writer
Operating System - Microsoft Windows 8.1 (OEM) (64-bit)

Have you tried the WD in another system?

Nope. All I have is a laptop. I might be able to take it down to a computer store down the street and they can check it for me.

Any friends or relatives with desktops?