Computer randomly shuts off and wont turn back on unless unplugged (sometimes) help!

[duncan_8]

This is a very weird and confusing issue for me as I am usually pretty good with computer problems but this one stumped me.
This problem started off about 5 months ago... The computer worked fine for about 8 months before that with no problems. Okay so randomly when im using it, it will just completly shut off. The moniter goes black the fans turn off... This would happen in the middle of me using it. No bios, no beeps, no nothing. IT would never turn directly back on sometimes I would have to unplug the power cable and plug it back it... sometimes i would have to wait hours, sometimes as long as a full day before it would turn back on. It didnt happen for the last week so I thought it was fine but it just did it a few hours ago. It dosnt matter if im playing games on max settings or just browsing the internet it would do it anyway. I finally tried the paperclip trick and the PSU spun up just fine but after plugging it back in to the computer nothing happened. I have tried unplugging and cleaning out all the cables, unplugging and replugging in components, and untangling unused cords to check for shorts. The thing that confuses me the most is why it would turn back on if it shuts off randomly? Do you guys thtink its a PSU issue or something else? I will list my compnents and their approximate age in order for you to better understand my issue. (I built this computer myself and it worked perfectly for a long time)
Z97-G45 Gaming Motherboard (Bought new less than a year old)
I5-4690k (Bought new same time as motherboard)
GTX 1060 (Bought new less than 2 months ago)
Corsair CMPSU 600G (About 3 years old but only used for the last year or so)
Intel 2gX4 Ram (About 3 years old but only used for the last year or so)
There are plenty of 120mm fans to keep everything cool and temps have never been over 58C so im not worried about overheating.
Please help me I have absolutely no idea what is wrong. At this moment I cannot get it to boot. Pressing the power button does nothing.

 

[helpstar]

did you fresh install windows with the new board?

BIOS is up to date? Flash in BIOS not in windows!

deactivate c-states in BIOS (the PSU should be haswell ready, but just to be sure)
http://www.corsair.com/en-us/blog/2013/may/haswell-compatibility-with-corsair-power-supplies

is it overclocked?

atx12V 8 pin connector connector and not just one 4pin?
test with another power supply

run prime95 version 26.6 + coretemp
run furmark stresstest

boot memtest86+ installed on an empty usb flash drive

run crystaldiskinfo to check the HDD/ssd

 

[duncan_8]

Windows was fresh installed but it was on an old harddrive that I wiped. Everything should have been up to date. Never overclocked. A new power supply is coming in tomorrow so I can try that. Computer will still not start up after yestedays random shutdown... I had someone tell me its possibly my BIOS Battery? Is that possible

 

[helpstar]

BIOS battery of such a "new" motherboard shouldn´t be the problem

Reset BIOS while the PC is off and not plugged into the wall socket. Press the power button 5 seconds to discharge the capacitors of your system. Then remove the battery for a few minutes and place it back (plus on the visible side).

If this doesn´t work reset BIOS by jumper, read the manual of the motherboard, how to clear cmos (clrcmos).

 

[duncan_8]

I removed the battery and reset the cmos. That didnt work. I put the new power supply in and that did nothing. I tried the paper clip test on the new power supply and it worked just fine. I tried removing the case power switch cable and shorting it with a screw driver and that did nothing. I removed the gpu (has onboard) and all but one stick of ram and it still would not start. As of right now pressing the power button does nothing at all. Im at a loss now what can I do?

 

[duncan_8]

I ended up RMAing the motherboard because the MSI support was sure it was the board. Thanks for the help! Hopefully it gets fixed.

 

[helpstar]

alright, please give a feedback, if it worked out for you