Boot loop issue (Z87 chipset)

[Crowcore]

Hey,

I recently built a system for a friend with mostly parts I had laying around, and shipped it to him. Unfortunately, it is plagued by a boot-loop issue of 3 seconds that somehow didn't happen here the 2 days prior to the shipment (it did on occasion before).

 

There is nothing on the screen when that happens, but the fans do start to spin. The only way out of this is to put the MB’s jumper in the « Clear CMOS » position, then put the bridge-thingy back to the normal position, and turn on the machine. The computer starts normally. Restarting it though the OS doesn’t lead to this problem. Going into sleep and then waking up again, is also fine. Shutting it down and turning it on, still fine. But turning it on after having turn off the electrical strip or switched of the PC PSU, it won’t turn on again without the infinite boot-loop.

 

The debug LED doesn’t display anything during the process and the UEFI is up to date. Any ideas would be appreciated.

 

Specifications

          CPU: Intel i3 4370 (3.8 GHz)

MB: Asrock Z87M OC Formula (micro-ATX)

RAM: Curcial Ballistix Tactical 4x4GB (low-profile)

GPU: [On board]

SSD: Sandisk X400 256GB

PSU: Cooler Master V450SM (80+ Gold)

Case: Silverstone SG12 (mini-tower)

HSF: Thermalright AXP-200 Muscle (slim 140mm fan)

 

What we tried:

- Setting UEFI to default

- SSD & MB battery change

- Pulling the physical switch to use the second UEFI

- Using just one stick of RAM

- Using another stick of RAM on other DIMM slots

[Crowcore]

No one ?