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ASUS Z87-Pro does not post

Level 7

I just bought components for a new gaming PC and am having problems starting the computer.

This is my setup:
Asus Z87-PRO
Intel Core i7-4770K
Patriot Viper 3 16GB DDR3 PC-17000 2133MHz (PV316G213C1K) (2x8GB)
Samsung 840 Pro Series SSD 128GB SATA3
Zalman ZM750-HP

I thought that my somewhat old PSU should work fine with the new motherboard, but when plugging it in and pressing the start button the computer only powers on briefly (0.5 to 10 seconds) and then restarts.
I have tried with and without CPU, with one stick of RAM in different slots and also with my older DDR3 ram (OCZ Platinum 4GB DDR3 PC3-12800 1600MHz (OCZ3P1600EB4GK) (2x2GB)).
The 8-pin and 24-pin connectors are securely fastened to the motherboard.

Also my PSU works fine with my older ASUS P5Q3 Deluxe/WiFi-AP @n motherboard (tested this several times afterwards).

I thought the problem was with the motherboard so I returned it to the store (RMA), where they confirmed that it was faulty and then I got another one. The thing is I'm having the same problem with the new motherboard, only difference is it usually takes a few extra seconds before it restarts.

I found a few similar posts (and the solution seemed to be RMA):

This is driving me insane! Any suggestions?

Level 7
I finally solved the problem, getting my 3rd Asus Z87-PRO board and also a new PSU (Fractal Design Newton R3 600W). This was a bit of a gamble on my part since the store has not yet decided whether to accept my second RMA. Also I couldn't find any PSU to borrow so this seemed like the last resort.

Anyway I'm super happy everything works now, and to anyone having a similar problem - even though your old PSU (Zalman ZM750-HP in my case) might look like it's got everything you need (and it even works with other old motherboards) you can't be sure it will work properly with a new one.

Level 40
A PSU is such a key part of the whole build. I tend to swap out or replace my PSU after 3 years even if they are seemingly in perfect condition. Modern PSU's it can be argued will give you longer life but I do not want to take that risk.
To help us help you - please provide as much information about your system and the problem as possible.

Level 13
Maybe your original PSU is not qualified to run with Haswell (known issue). Some PSU vendors have created Haswell validation lists as a result.

Level 7
I had been considering Haswell compatibility but from what I've read an incompatible PSU only means it requires a few extra watts in sleep. See this: