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Asus Sabertooth z77 - Red CPU light

Last response: in Motherboards
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May 20, 2013 5:05:36 PM

I have a new Asus Sabertooth z77 and Intel i5 processor. I had trouble with receiving no post upon boot, so I stripped everything out of my rig, booting off of just CPU, motherboard, PSU, and one stick of Corsair Vengance 4GB ram. Unfortunately, this is new ram and I don't have a spare DDR3 mobo to test it in, so I'm switching between the two sticks I have just to make sure it isn't a RAM issue. I am getting no display to my monitor. The red CPU light is lit on the mobo, which according to the documentation, means a CPU error.

My process of elimination:

    Removed CPU and reseated it
    Tried two different heatsinks in case my aftermarket one was causing the issue
    Double, triple, quadruple checked that both the 8-pin and 20-pin connectors were installed correctly
    Tried varying ram configurations
    Tried different HDMI cords
    This PSU was working fine with my other Mobo, so I don't think it's that.
    Unfortunately, I'm making the switch from AMD to Intel, so I don't have another CPU to test on the board.
    CPU and mobo fans ARE spinning
    Board will continue running for extended period, i.e does not restart after a few seconds, indicating overheating


My question is, is it pretty certain I have a bad CPU? Or is there something I'm overlooking? Thanks in advance for any assistance.
a c 114 à CPUs
a c 559 V Motherboard
May 21, 2013 10:46:19 AM

Hi, What processor using?
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a c 114 à CPUs
a c 559 V Motherboard
May 21, 2013 12:40:23 PM

It is supported. To rule out a short, try taking the board outside the case, put it on its cardboard, leave only CPU and CPU fan installed, make sure that the 24, 8 pin and CPU fan wires are connected and start the board.
See if still red CPU led.
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May 21, 2013 2:59:16 PM

That is what I meant in my original post that I had stripped it out of my rig. Sorry, wasn't clear enough.

I have done exactly what you have suggested, and yes, the light is still red.

Thanks for replying.
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a c 114 à CPUs
a c 559 V Motherboard
May 21, 2013 9:54:01 PM

Since you've reseated the CPU and the CPU fan is spinning, then I'd say it's either a board or a CPU issue. I would RMA them. Check the CPU socket for bent pins after removing the CPU.
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May 22, 2013 7:46:55 AM

That's kind of what I figured, but wanted to make sure before I went through sending them back. Thanks for the reply!
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