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

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SriK64

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Aug 21, 2013
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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
 
Solution
S
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.
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SriK64

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Aug 21, 2013
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Yes, both power cables are connected. I've been trying with only one stick of RAM, and swapping out different sticks, etc. There isn't any thermal compound on the bottom of the CPU or in the socket, and there don't appear to be any broken pins.
 
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SriK64

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Aug 21, 2013
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Well like I said, I ordered a replacement motherboard from Amazon and tested on it as well, and the problem still occurred both on the old mobo and the new one. So it probably isn't the motherboard.



CML16GX3M4X1600C8. It's this. It turns off even if I run with no RAM at all, however.
 
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SriK64

Honorable
Aug 21, 2013
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10,520


Like I said in the OP I took the motherboard out of the case and have been doing all testing on a bench/cardboard box. Originally I thought something was shorting but the problem still occurred out of case as well.
 
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S

SriK64

Honorable
Aug 21, 2013
5
0
10,520
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.
 
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Solution
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pierson15

Honorable
Feb 12, 2014
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Make sure the metal bracket holding the heat sink into place isn't touching the back of the motherboard, causing a short.

Either get a new heats sink or some rubber washers and new stand offs so the bracket doesn't physically touch the motherboard.
 
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