ASUS P8Z77-V LK won't POST -- powers on for 1 second, then off

[SriK]

Hi,

This is my first real time building a PC. When I was near-done building, I decided to finally test it, so I turned it on. It seemed to be working...for about a second, before the fans stopped spinning. Connecting it to a monitor didn't display anything, either. So I took the motherboard out of the case and used only the following parts:

Motherboard: ASUS P8Z77-V LK
Power Supply: EVGA SuperNOVA NEX750B
CPU: Intel Core i7-3770K 3.5GHz
CPU Cooler: Cooler Master Hyper 212 EVO
RAM: Corsair Vengeance DDR3-1600

The problem still occurred out-of-case as well. Clearing CMOS and changing out the RAM didn't seem to help either. Case fan and power supply connectors are all connected properly, CPU and RAM are seated correctly, etc.

I tested the power supply with a paper clip/multimeter, and it seemed to check out (and the green LED on the motherboard is lit). I also got a replacement motherboard (same model, ASUS P8Z77-V LK) from Amazon and tested the same parts listed above with the new one, and the problem still occurs. So at this point I'm thinking it's either a faulty CPU (or static damage?), or I'm missing something obvious. Any help would be greatly appreciated.

Thanks for your time,
Sri

 

[avtar2008]

any buzzer sound before power off and does fans of cpu cooler rotating on power on. If you have stock heatsink of cpu, try it in place of hyper 212. *I think* problem is in contact of cpu cooler.

 

[Kenmitch]

Maybe you forgot 8pin cpu power connector?

 

[SriK]

The 8-pin (two 4-pin in this case) connector is in, and the fan of the CPU cooler does rotate when it powers on (along with the PSU fan). No buzzer sounds before powering off. I'll try the stock heatsink in a bit and see if that helps anything.

 

[Ketchup]

In my experience, a faulty CPU will not cause the instant power down you are seeing. Usually this occurs when there is a short somewhere. If everything is plugged in, and you have taken the computer out of the case to eliminate a grounding issue, I would put the power supply on top of my list of suspects.

 

[SriK]

I tried with another PSU, and same thing. I also tried using the current PSU to power another machine, and that machine worked. So the PSU, motherboard, and RAM are all probably eliminated at this point, leaving only the CPU. I'll order a replacement CPU from Amazon and see if it works.