MOBO will not POST, restarts continuously

[Siactive]

Hello, my components consist of

-i7 7700k

- Gigabyte z270x gaming 5 Mobo

- EVGA supernova 750W gold PSU

- Corsair vengeance LPX DDR4 RAM

 

The problem occurred last night as I was gaming, my PC hard crashed. It automatically tried to reboot, with fans spinning and LED's coming on for a second before shutting off, repeating indefinitely.

 

I have

- verified PSU is good, it's running my old system right now

- removed all peripherals and breadboxed newer PC with just CPU, RAM, same issue

- removed CMOS battery for one hour, and used jumpers to reset CMOS. No change

 

I am not getting post codes on the Mobo, nor am I getting any beeps off my Mobo speaker with the RAM unplugged altogether.

 

Fans and LED's will stay on without the 8 pin CPU connected, but as soon as 8 pin is connected the loops occurs again. Made me think it might be a bad PSU, but it's powering my 3770k/GTX 970 system right now with no problem.

 

I'm thinking bad Mobo, anyone have anything else I should try? 

Thanks!

[Cyracus]

Hard to say between mobo and cpu...steal a 1151 socket cpu or system from a friend and test the cpu or mobo, should indicate where the problem lies

[Siactive]

16 hours ago, Cyracus said:

Hard to say between mobo and cpu...steal a 1151 socket cpu or system from a friend and test the cpu or mobo, should indicate where the problem lies

Thanks this turned out to be the best option. Your post reminded me we were building a few systems with 7700s at work. Tried one of them, same result but now even the 24 pin Mobo power seems to short the board. Time to RMA to Gigabyte! Thanks Cyracus!