Asus Z87-pro not posting

Only things i could think of is maybe the psu is not haswell ready.Also Stand off screws are important, but unless the stand off was actually causing a short by being in the wrong place, I doubt it was the cause.Maybe the motherboard is faulty sorry if this is not very helpful.It's all i can think of lol.

After looking further into it seems you are correct.

QUOTE: Corsair described the problem more elaborately in an e-mail to us, which reads:

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.
Since the news broke, a number of PSU vendors have indicated which of their power supplies fully support Intel's new processors. We covered some of those announcements, but keeping track of all of them has been difficult. In an effort to be thorough—and, you know, to make things easy for everybody—we've spent a few hours compiling compatibility information from all the major PSU vendors.

Before we proceed, we should be clear about one thing: you don't, strictly speaking, need one of these "Haswell-ready" PSUs to build a Haswell system. Corsair told us that it "fully expects" motherboard makers to let users disable the new low-power power state in the firmware. Cooler Master went even further, stating that, to its knowledge, "all mainboard vendors" will disable the new low-power state in their boards by default. In other words, you may never encounter any issues even if you pair a Haswell platform with an incompatible power supply.

That said, Haswell's lower-power sleep state is one of the perks of the new platform. Compared to the prior generation, it cuts minimum sleep power consumption from 6W to about 0.6W. Those kinds of power savings may not add up to much on your power bill, and they probably aren't worth the price of a brand-new PSU. However, if your current unit is already compliant, you might as well enjoy the reduction in sleep power. Also, of course, folks building a Haswell system from scratch are better off getting a compatible unit to begin with.

Did anyone find a solution to this? I've had the exact same issue but I've had no luck so far. I'm close to sending the motherboard back to the retailer but I get the feeling this problem has nothing to do with a faulty motherboard.

I'd bench it, have a guide here that might help:

http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html