New Build: how to troubleshoot MOBO issue?

Just built my first ever budget gaming rig, but have a problem with the MOBO:

1) $110 MOBO: ASRock 970 EXTREME4 AM3+ [...] 6813157262
2) $90 CPU: PhenomII x4 840 on eBay
3) $50 RAM: 2x 4GB G.Skill DDR3 [...] 6820231422
4) $65 HDD: Western Digital WD7502AAEX 750GB 7200 RPM 64MB Cache SATA 6 [...] 6822136794
5) $45 DVD-R: HP 1260i [...] 6827140042
6) $110 PSU: CORSAIR Enthusiast Series TX750 80 PLUS BRONZE
7) $130 GPU: Galaxy GT 465 [...] 6814162052
8) $50 Case: Rosewill Challenger [...] 6811147153
9) $100 OS: Win7 64-bit

After assembly, tried to power up. Nothing.
So tried the PSU paperclip test. Voila! PSU is functioning.
Note: Used a Rosewill 850w PSU for this (have since gotten nervous about a Rosewill unit, shipped it back and ordered the Corsair TX750 as replacement).

So what are the next step(s) to troubleshoot this process?
Assembled the rig as per a Tomshardware doityourself tutorial.
a) Had both the ATX 12v (8pin) and ATX main power leads firmly attached.
b) Got the case switches attached..

God, I'm hoping the MOBO's not DOA, as it took forever to get it installed.

Perhaps it's the case switch broken?
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More about build troubleshoot mobo issue
  1. The Corsair PSU is a lot lot better than the Rosewill!

    If you think the case switch may be bad, just trace the wires to the motherboard pin headers and momentarily short those 2 pin headers using a flat screw driver. This will simulate the switch.

    Next thing to try is:
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