Asus Mobo or PSU Power Cycle Problem

chrisloudon

Hi All,

I have an intermittent issue with a recent build. Specs as follows:

Asus Rog Strix Z370 I Mini ITX mobo
Core i7 8700k   NZXT Kraken X62
16GB Corsair 3200 DDR (2x8)
EVGA 1080ti
Samsung NVME boot drive
Windows 10 Pro
Corsair 850w PSU
Corsair 250D

The problem I am having is occasionally the system will throw a wobbler, restart, then keep restarting indefinitely. You will hear the click of the PSU firing up, the fans will spin for a second or 2 then stop then start up again for another second or 2 then rinse and repeat until I turn the power off completely.

At first I thought it was a bad memory controller since I managed to get the system to boot using only Dimm slot 0 (either module worked) but after running on only 8GB for a few days I decided to pop the 2nd module back into slot 1 and everything seems ok now.

At the time of the 1st failure I was running a mild manual overclock of 4.8Ghz on all cores with a small increase to vcore and had XMP enabled. After getting the system to boot again with a single Dimm I reset the BIOS back to stock settings but the problem returned.

I suspect a faulty Mobo but just wanted to ask around here first.

Cheers

C

CARLOS

Have you removed the psu and refitted it just in case its a dodgy connection somewhere ?

Also remove the Motherboard and check there are no standoffs in the wrong place or anything else that could be shorting the back of the board.

Does the case have a reset button as well as power button, if so disconnect the reset button and run it without it to see if that makes a difference ?

Bigfingers

Have you disconnected the battery and held the power button down for 20 seconds? I had this once on a Gigabyte board years ago. It was a bad overclock config that wasnt cleared properly.
After that boot back into bios and select factory/optimal defaults.

DavidG1

It could be a faulty motherboard, PSU or less likely CPU. You haven’t entirely excluded a RAM fault, or RAM slot fault - swap round the single DIMM into the other slot, and retest, then swap out for the other DIMM and do the same tests.
I would also strip everything out check for loose screws, standoffs,  grounding straps around the I/O shield etc. Check all the connections and retest. The only real way to check for a faulty PSU or motherboard is to replace with known good working parts. I have also seen a similar problem with a faulty reset switch, so disconnect that from the motherboard header and see if that cures it