Hi, i need some help to see whats causing my pc to crash, but right now im guessing its my evga supernova 550w gold psu.
anyway my pc is crashing and its getting worst..i used to get 1 or 2 times crash each game, where my pc would suddenly turns off and restart when I play leage of legends for about an hour, now as soon as i get back to windows and run my computer it would randomly shutoff again and restart..i dont get blue screen or any kind of error when this happen..when my pc crash i will jst notice my pc will complete shutoff then restar a few seconds later, and i didnt get any message or error code, it will restart like nothing happens..right now my pc has been crashing lime 8 times a day...and my lol acc is on 20min que for leaverbuster penalty cause of this.
 
I thought it was my gpu gtx 970 so i switched my old gtx 670ti but then i still get a crash after trying it out..i dont have any spare ram or psu or cpu to see which is causing the crashes..so im asking if u guys know what is it that causing my pc tho crash like this pls let me know. And i didnt oc anything. 
 
Also if evga can help me get a replacement if the psu is indeed the porblem. I bought it on oct 10 2015 at newegg. Thank you.
 
My spec are..gtx 970 4gb zotac extreme core edition
windows 10 64bit
16 gb corsair ram
i7 6700 @ 3.4ghz
evge supernova 550w gold psu
2tb hybrid hdd
55inc 4k samsung tv

Will i get replacement from evga if my psu is the problem? I dont think i registered it here.

The EVGA 550W Gold series (G2/GS) has an ECO Mode switch that's on the inside where the modular cables connect..There have been some reports here and there of some units failing when ECO Mode is enabled..You could try turning ECO Mode OFF to confirm if that is your issue..ON is the default position..If it works when ECO Mode is disabled, the unit is no good..If it don't matter either way, then I'd say it's time to contact EVGA in your region to RMA the unit..You could always try the XCLIO 650W out of your other box (or another PSU if you have one) and see if it works okay if it's not much hassle, which is what I would do.

ok it is confirmed its the psu..i think it finally died..i turned the eco on because it was off the whole time..the like after a minute my pc crashed and restarted, about a min later it crashed again and restarted..and wont stop crashing so i turned the eco off again and it just keep crashing now, i have to unplug it to stop it from rebooting over and over..someone from evga pls help me my pc is dead now, im using my old computer right now..also i tried to register my psu to get it rma but the part/serial numbers  are missing from the box because i cut if off to get my rebate..i forgot to make a copy of it. evga please help me on this...thank you!

Contact EVGA Support and they'll get it all straightened out for you and answer any questions you have..But I really would put the XCLIO 650W in and see if it works okay as I suggested above.