Question i5 7400 CPU not working but i7 does?

[hardwarelord]

Hi,

I've got a Asrock Z270i itx Fatal1ty motherboard https://www.asrock.com/mb/intel/fatal1ty z270 gaming-itxac/index.asp

And I've bought a i5 7400 CPU, which is compatible according to the list https://www.asrock.com/mb/intel/fatal1ty z270 gaming-itxac/index.asp#CPU

And this is not working. The computer starts and I get no post, then it stops again and restarts in a boot loop?

I've tried this with 2 different i5 7400 CPUs now and I think its not the CPU thats the problem.

I also have another computer, which has Asus Z270i Strix gaming motherboard (which also shows compatible CPU fpr i5 7400

ROG STRIX Z270-I GAMING | ROG STRIX Z270-I GAMING | Gaming Motherboards｜ROG - Republic of Gamers｜ROG Global

Best Mini-ITX Z270 gaming motherboard with double-decker PCH and M.2 heatsink, Aura Sync RGB, DDR4, 2x2 Wi-Fi, and USB 3.1 (successor to Pro Gaming)

rog.asus.com

) and a i7 6600k. I put both the i5 7400 in here and it does not work.

Both motherboards say that a new bios is not needed and it should work with all bios revisions.

So Im stumped,

I wonder is there some kind of switch to get an i5 working with these motherboards, or is there something maybe I overlooked? Maybe I should updat bios anyway?

Cheers

Si

 

[Koekieezz]

Hi,

I've got a Asrock Z270i itx Fatal1ty motherboard https://www.asrock.com/mb/intel/fatal1ty z270 gaming-itxac/index.asp

And I've bought a i5 7400 CPU, which is compatible according to the list https://www.asrock.com/mb/intel/fatal1ty z270 gaming-itxac/index.asp#CPU

And this is not working. The computer starts and I get no post, then it stops again and restarts in a boot loop?

I've tried this with 2 different i5 7400 CPUs now and I think its not the CPU thats the problem.

I also have another computer, which has Asus Z270i Strix gaming motherboard (which also shows compatible CPU fpr i5 7400

ROG STRIX Z270-I GAMING | ROG STRIX Z270-I GAMING | Gaming Motherboards｜ROG - Republic of Gamers｜ROG Global

Best Mini-ITX Z270 gaming motherboard with double-decker PCH and M.2 heatsink, Aura Sync RGB, DDR4, 2x2 Wi-Fi, and USB 3.1 (successor to Pro Gaming)

rog.asus.com

) and a i7 6600k. I put both the i5 7400 in here and it does not work.

Both motherboards say that a new bios is not needed and it should work with all bios revisions.

So Im stumped,

I wonder is there some kind of switch to get an i5 working with these motherboards, or is there something maybe I overlooked? Maybe I should updat bios anyway?

Cheers

Si

If your bios is old, then update it to the latest.

 

[geofelt]

When testing did you first clear cmos?
I would hope that you had a cpu cooler mounted and the cpu fan connected.
A stick of ram installed.
Where did you buy the I5-7400 processors?
Are you certain that they are genuine?
It is very unusual to have an intel processor fail, let alone two.

You will not be able to update the bios without a cpu installed.