New build constantly restarting, every second or so. What could be causing it?

Bailey has sent me an RMA for the board :)
I was willing to send all the components back, but I explained that I didn't know whether it was the board, CPU, or RAM, explained everything I've tried and he said that it sounds like a motherboard problem.
 
Well...I got the replacement motherboard, but...things still aren't quite right.

This time it boots up into BIOS with no problems (with video output too!), but only if I don't have the sticks of RAM in slots 1 or 3.
I can boot with a single stick in either slot 2 or 4, or with both sticks in those slots, but if I put a stick (either of them) in either slot 1 or 3, it tries to boot for about 15 seconds (with no video output) and then restarts.
I've tried each stick in every slot, and every possible combination of both.
 
Motherboard: Gigabyte Z87-D3HP Intel Z87 (Socket 1150) DDR3 ATX
RAM: Kingston HyperX Beast 8GB (2x4GB) PC3-19200C11 2400MHz Dual Channel Kit (KHX24C11T3K2/8X)
 
Got the Bios updated, but unfortunately no luck, same problem when the stick's in slots 1 or 3, whether on its own, or along with the other stick in any other slot.
Made sure the CPU cooler was only tightened loosely.

So...another faulty motherboard? :/
 
Yeah, made sure that I've only screwed the fan down lightly.
Reset the CMOS, no change.
Haven't installed the OS because I haven't even hooked up a drive yet. Running with just the motherboard, CPU+Fan, RAM, and GPU.
Didn't want to start building/setting up properly until I knew the motherboard was working properly.
 
There is one that doesn't look quite right, to me.

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P1040475.jpg

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Aye, getting really frustrated now.
This means I'm going to be waiting another week for a replacement, and after this weekend, I'll rarely be coming home. I was hoping to take the new system with me.
I paid the best part of £700 (more than, if you include the PSU I needlessly bought, just in case it was a PSU problem), have already gone through the hassle of arranging returns, driving to the UPS Access Point to send the faulty board back, and making sure there would be somebody home for the replacement to be delivered. More than two weeks after placing the order, I still haven't got a working system. :(
 
Thanks Wazza :)
With the way my luck's been, when it comes to the motherboard, I'm going to have to pick it up at a bricks and mortar place. I can't afford to spend more time sending stuff back and to. At least this way, I can exchange it on the day if my luck continues :)
 
I bought another motherboard today (stuck with the Z87 D3HP) and so far, so good!
Haven't built the whole system yet, but the dreaded problems getting into the BIOS and constant system restarts, aren't an issue anymore, and RAM is working in all 4 slots.
3rd time lucky? I hope so!
 
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