PC turns off and on by itself during boot

tango2601

Commendable
Mar 21, 2016
2
0
1,510
Hello. So the situation is as follows: bought new MB, cpu, ram, installed them in the case, and sometimes on power on the fans would start spinning, but no image on monitor and after a few seconds the computer would turn itself off briefly, then back on again (by itself, I'm not touching anything at this point). And it would do that several times until finally monitor turns on and it boots to windows. After some investigations it turned out that this would not happen if I took one of the RAM sticks out (I have 2x4 GB Kingston Hyperx 1600 MHz DDR3). I tested both RAM sticks in multiple slots, with same results - one would boot fine and everything would work as expected, the other causing multiple restarts at power on. So I went to the retailer and got a replace for the bad RAM stick. Put the new stick in, all good PC was working fine.

Now, the problem is I got a new HDD last friday, and after I installed it, guess what? The power off/power on thing is back, only this time it is doing it only once before booting properly (at least as far as I got to test it). So what's going on here?

Configuration:
CPU: Intel Core i5 6600K
Mobo: GA-B150M-D3H DDR3
RAM: 2x Kingston HyperX Savage 4GB DDR3 1600MHz CL9
Video: Sapphire ATI Radeon R7 370 Nitro 4GB
1x Samsung 840 EVO 120GB SATA-III SSD
2x Western Digital hard drives (500 GB+1TB)
1x Toshiba 2TB HDD (this is the new one)
PSU Sirtec/High Power Element Plus 400W (HPC-400-H12S)
 

tango2601

Commendable
Mar 21, 2016
2
0
1,510


Well after further investigation it seems it has nothing to do with the hard drive; the new RAM stick (replaced one) is the culprit. If I take it out of the motherboard everything works fine, as soon as I put it back in the restarts come back. I honestly have no clue what's happening. Also tried the "bad" stick in the slot of the good one, and same behavior. I guess I'll try going again to the retailer and get another replacement for that RAM.

As a side note, in the meantime I also ordered a new, better PSU. To be honest this Sirtec is not that bad, I ran a Q8300 and a Radeon 5750 on it for more than 5 years with no problems.