New motherboard won't post.

[Yikchandev2]

So I thought my psu was fried, until I tested it on my other build and it worked. My pc powers on for a split second, not even 1/2 a second, then turns off. However, I unplugged the EPS cable and now at least it stays on for 3 seconds. It also restarts in a constant loop every 3 seconds. I have stripped everything and am using only 1 stick of ram, onboard graphics, cpu psu and mobo. Another working powersupply from another build doesn't work either. I suspected it to be either the cpu or mobo, so I replaced the mobo and it's still happening. It's on cardboard right now and the motherboard is a gigabyte ga-z87-hd3. I7 4770. Cx750m and rm850x. I need this build up and running for my son's birthday coming up in a week.

 

I have also reset cmos, new battery, and tried every ram slot. The motherboard is a refurb from eBay which he took pictures of it working before shipping. No bent pins, nothing seems exploded or shorted on the motherboard. 

[Aree Soothsayer]

12 minutes ago, Yikchandev2 said:

So I thought my psu was fried, until I tested it on my other build and it worked. My pc powers on for a split second, not even 1/2 a second, then turns off. However, I unplugged the EPS cable and now at least it stays on for 3 seconds. It also restarts in a constant loop every 3 seconds. I have stripped everything and am using only 1 stick of ram, onboard graphics, cpu psu and mobo. Another working powersupply from another build doesn't work either. I suspected it to be either the cpu or mobo, so I replaced the mobo and it's still happening. It's on cardboard right now and the motherboard is a gigabyte ga-z87-hd3. I7 4770. Cx750m and rm850x. I need this build up and running for my son's birthday coming up in a week.

 

I have also reset cmos, new battery, and tried every ram slot. The motherboard is a refurb from eBay which he took pictures of it working before shipping. No bent pins, nothing seems exploded or shorted on the motherboard. 

Check your motherboard, there should be a switch on it that will allow you to use the backup bios.

[Yikchandev2]

There's no switch;/

[Aree Soothsayer]

57 minutes ago, Yikchandev2 said:

There's no switch;/

Did some googling. Try this.

 

[-rascal-]

3 hours ago, Yikchandev2 said:

So I thought my psu was fried, until I tested it on my other build and it worked. My pc powers on for a split second, not even 1/2 a second, then turns off. However, I unplugged the EPS cable and now at least it stays on for 3 seconds. It also restarts in a constant loop every 3 seconds. I have stripped everything and am using only 1 stick of ram, onboard graphics, cpu psu and mobo. Another working powersupply from another build doesn't work either. I suspected it to be either the cpu or mobo, so I replaced the mobo and it's still happening. It's on cardboard right now and the motherboard is a gigabyte ga-z87-hd3. I7 4770. Cx750m and rm850x. I need this build up and running for my son's birthday coming up in a week.

 

I have also reset cmos, new battery, and tried every ram slot. The motherboard is a refurb from eBay which he took pictures of it working before shipping. No bent pins, nothing seems exploded or shorted on the motherboard. 

 

I had similar / exact symptoms with my i7-6800K on my ASUS X99 Deluxe II motherboard some time ago.

Since I had spare parts lying around (everything aside from a spare LGA 2011-v3 CPU and compatible motherboard), I ruled it down to the CPU or motherboard.

Decided to bring it into a local PC store, who had extra CPU and motherboard.

 

Your system might have suffered the same fate.

I hate to say it, unfortunately, at least for me, it was the CPU that ended up dying.

Couldn't get a replacement from Intel (since LGA 2011-v3 is already discontinued), so they gave me a refund instead, LUCKILY.