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New ASUS build won't POST!!!!! First Build Pls help!!!!!

Last response: in Motherboards
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June 24, 2013 12:29:01 AM

New build specs:

Intel Core i7 4770K 3.5GHz (Haswell) (Socket LGA1150)
HIS Radeon HD 7850 2GB Graphics
Asus Sabertooth Z87 MOBO
Corsair H80i Closed loop CPU cooler
Corsair CX 750M PSU
Corsair Vengeance Pro 16GB (4x4GB) DDR3 1866MHz
Crucial 128GB M4 SSD
WD 1TB SATA HDD
Antec P280 Case

It won't boot and the MemOK button stays lit..
I tried pressing the MemOK switch after several attempted boots to no avail, just blinks and then stays lit.
The only things definitely working are the fans.

Stripped everything down and reassembled.

Checked the CPU. I can't see any bent pins. They all look identical.

Ram - I originally had Vengeance 2133MHz 4X4GB. Noticed in the manual that the board supports up to 1866MHz so I exchanged RAM for 1866 Vengeance Pro's.
MemOK still permanently on and doesn't respond to being pressed.

Any advice would be greatly appreciated

a b V Motherboard
June 24, 2013 12:32:10 AM

sounds like a defective motherboard
a b V Motherboard
June 24, 2013 12:42:39 AM

Try running with one stick of RAM at a time, and in different slots. Bear in mind the memory controller is integrated into the CPU, so there are three possible areas to fail...
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June 24, 2013 2:31:34 PM

So I just went and exchanged the MOBO and CPU. I will let you know how it turns out. I figured that it had to be a bad MOBO.
June 25, 2013 7:38:51 PM

It was either the Board or the CPU because everything started up just fine 1st time I tried. Thx for your help. Now to see if I can tune this machine. No idea what I'm doing. I did notice that the BIOS read my RAM as 1333MHz. I turned up to 1866 as they are 1866 sticks. Any thoughts as to why that would happen?
a b V Motherboard
June 25, 2013 8:43:26 PM

http://www.asus.com/Motherboards/SABERTOOTH_Z87/#specif...
Your ram is Quad/dual channel modules, your motherboard is only dual channel architecture, you can only use two sticks of the quad channel ram for it to revert to dual channel use.

The ram would revert to the lowest mhz available being 1333mhz, as they are no longer 1866mhz in dual channel mode.
a c 1305 V Motherboard
June 25, 2013 8:51:10 PM

Wrong - the CPU runs dual channel makes no difference if running 2 or 4 sticks, it's still dual channel, and all 4 sticks will run at full spec,.. They came up 1333 as that is the mobo default boot speed, best way (if the BIOS is ready) is simply enable XMP, select Profile 1 and go,,,check in CPU-Z (free utility) the memory tab should show 933 under freq (It's DDR DOUBLE Data Rate do 933 x 2 = 1866 effective,,,

TenPC - need to learn at least BASICs of DRAM before offering advice
a b V Motherboard
June 25, 2013 8:58:53 PM

Tradesman1 said:
Wrong - the CPU runs dual channel makes no difference if running 2 or 4 sticks, it's still dual channel, and all 4 sticks will run at full spec,.. They came up 1333 as that is the mobo default boot speed, best way (if the BIOS is ready) is simply enable XMP, select Profile 1 and go,,,check in CPU-Z (free utility) the memory tab should show 933 under freq (It's DDR DOUBLE Data Rate do 933 x 2 = 1866 effective,,,

TenPC - need to learn at least BASICs of DRAM before offering advice


Sorry, you are WRONG. QUAD Channel Ram cannot run in Dual Channel slots utilizing all four sticks, only way to use Quad channel ram in dual channel is to use only two of them.

Best solution

a c 1305 V Motherboard
June 25, 2013 9:05:57 PM
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Odd, I've built over 700 systems this way with four stick going back to 775 and all are running in dual quite nicely, thank you, the preferred way is 2 sticks but 4 still run in dual with a dual MC channeled CPU...just like running 6 sticks in tri - it's still tri or 8 in quad is still quad
!