New rig won't post--CPU overvoltage light on

Menalaus · May 23, 2015

Greetings,

I recently built a new computer and I am having trouble having it post. When flipping the PSU on, the CPU overvoltage jumper light on the motherboard (Asus Z97) turns green. The CPU is a i7-4790K. The PSU is an EVGA 850 B2. I have moved the jumper to pins 2-3 and the light still turns green after flipping the PSU switch. The computer will not post (no beeps, powers on, remains idle, no BIOS screen).

Yes, I have followed all of these steps: http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

Full specs:

Tower: Corsair Carbide Series 200R Black Steel / Plastic compact ATX Mid Tower Case

Motherboard: ASUS GRYPHON Z97 Motherboard

PSU: EVGA 850 B2

CPU: Intel Core i7-4790K Devil’s Canyon Quad-Core 4.0GHz

Video card: GeForce GTX 970

RAM: 2x4GB

HD: Seagate Barracuda 2TB

Optical Drive: Samsung DVD burner

alexoiu · May 23, 2015

Hi, What are the last 4 digits on a sticker like http://www.guru3d.com/miraserver/images/2011/990fx-sabertooth/IMG_4499.jpg ?
Is there a case speaker http://images17.newegg.com/is/image/newegg/12-201-032-TS?$S300W$ connected to the motherboard?

zenn84 · Sep 28, 2016

I'm sorry to bump this old thread; but I've run into this problem just this week, exact same mobo + cpu, no oc, ran great for over a year. And this morning only the cpu_ov led would light up. I've taken the 'dummy list' step by step, only waiting on a systemspeaker to see what the bleeps will tell.

But I was wondering, since your problem is 'solved', what did you do to solve it?

alexoiu · Sep 28, 2016

The answer was selected without any reason by different person than the OP.
Does the CPU fan spin when starting the board? If not, then it might be a faulty power supply.

zenn84 · Sep 28, 2016

Ah I see...

Well, got it breadboarded right now. Only cpu cable, atx cable, on/off switch, cpu fan attached. I thought of the psu as well so I've swapped it out for one that's proved too work, but same outcome only that one led would light up. Tried clearing the cmos; via jumper and via taking out the battery, same outcome. Also reseated the processor, no bend pins or anything, but still the same outcome.

I've also done a visual inspection, but can't see any blown caps/burn marks etc. Also thought of maybe a surge of some kind, but we've had nothing but good weather + I got a surge protected switch box between the psu and outlet.

alexoiu · Sep 28, 2016

If removing the 8 pin power cable (leaving the 24 pin one connected), attaching a case fan to the motherboard and starting it, does the case fan spin?

zenn84 · Sep 28, 2016

I'll let you know tomorrow morning, I'm at CET +1. Thanks in advance for the help.

alexoiu · Sep 28, 2016

No problem.

zenn84 · Sep 29, 2016

With only the 24-pin attached and case fan attached, fan does not spin and same led lights up.

alexoiu · Sep 29, 2016

Try testing the power supply: https://www.youtube.com/watch?v=5FWXgQSokF4
See if a fan connected to it does spin.
If it does, then it looks like a faulty motherboard (assuming that the on/off switch does work)..

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New rig won't post--CPU overvoltage light on

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