New PC build wont post. Fans spin but then pc quickly shuts off and this repeats

surf4u2

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Dec 1, 2015
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4,510
Hello,
I am upgrading from an FX-6300 to intels new skylake i5 6600k. My old build worked great, but my GPU was bottlenecking a bit. So the only things I am reusing from my old build are the PSU (EVGA 600 watt 80+ bronze), case, and hard drives and ssd.

My new build is i5 6600k, gigabyte z170mx gaming 5 mobo, crucial 16gb (2x8gb) dddr4 2400 ram, and EVGA gtx 970.

I have built and unbuilt this at least three times checking to make sure everything is connected properly.

Just trying the bare minimum of ram, cpu, mobo, and psu.
When I turn it on, the fans spin up, led lights go on and I can hear the water pump all for about 5 seconds. But I get no display, no bios or post, and no beep codes. Then the system turns off and then restarts itself repeating the process over and over never making it to the bios or having anything show up on the display.

My first through was a dead mobo. So I returned it and got a new one of the same model. Hooked everything back up (again just the required parts to get to bios) but I still had the exact same problems.

Next I figured maybe it was the ram. So I tried both sticks of 8gb in every combination. Then tried each single stick in every slot. Still no display or bios. What are the odds of having both sticks of brand new ram being dead? I dont have any other ddr4 ram to verify.

I double checked that the psu works with my old system and it is fine. Also cleared CMOS.

Leaving the only option as a dead brand new skylake i5 6600k?

Before driving an hour away where I bought the parts does anyone have any other ideas I can try? Does this match the symptoms of a dead CPU?

Thanks!

Update: Just replaced the cpu with another new i5 6600k and new ram. Again this is my second mobo. Tried to boot it and still had the SAME problem. I am very frustrated with this build, and Im not sure what to do next. The only old part is the EVGA 600 watt bronze, which I know works because I just tested on my old system. Also when shorting the psu with a paper clip, it does NOT turn off like it does when plugged into the motherboard. Any ideas what to do next?
 

moulderhere

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Some motherboards are unable to power on due to the bios version. You should remove the bios battery, wait 2 min, plug it back in, then try turning on the computer. if that works, then you must do a bios update asap. Some motherboards shipping with older bios that simply require updating to handle the newer cpus.
 

surf4u2

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Dec 1, 2015
2
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4,510


Thank you for your help. I just tried clearing the CMOS again via the battery removal method, and I still am having the same problem. Any other suggestions?

I mean it has to be either the RAM or CPU right? Two dead motherboards seems very unlikely. But two dead 8gb ram sticks also seems unlikely...

 

moulderhere

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Are you getting any beep codes from it? I mean when you turn it on, see the fans spinning does it sit there with the screen blank yet beeping back at you?

If not, can you please put a PC Speaker onto pc speaker pins on the motherboard to hear what its saying.