Unstable pc

[Kenna]

About 5 days ago right out of the blue while playing a game my pc suddenly shut down and rebooted. Upon start up I was prompted with the message Asus anti-surge was triggered to protect system from unstable power supply. These occurrences happened a few times over the next few days, most often right after start up when launching a game, while playing a game and sometimes (rarely) when my pc is just idling. Lately the problem has gotten worse with my pc crashing almost every time try launching a game, also sometimes my monitor blacks out with a little bar indicating no DVI signal and my fans (case fans and graphic card fan) suddenly crank up. When this happens i can still hear sound and all the lights in my pc are still on, I have to power down when this happens. I tried updating my bios today version 1802(first time I ever did it) but it didn't do anything in fact I now have another problem, I now get blue screens I'm pretty sure its related to this because when I updated my bios I had to reapply my Overclock, using the exact same setting as before. Any help or tips would be appreciated

Specs

I5 4670k@4.5ghz

GTX 780

2tb WD black HDD

250gb samsung evo SDD

Asus Z87 plus motherboard

16gb ram @1600mhz

Corsair AX860i PSU 

[Rorgash]

...remove the OC and see what happens, i mean its CLEAR what the issue is, since it told you, if that doesnt help try another PSU... seeing as its a electrical issue.

[Akolyte]

Remove the overclock and clear hit MemOK which will clear all the frequency settings like your memory clocks etc and reset them to defaults.  Try a different power supply, If you cant get a replacement you dont need 860watts for your computer, even 600watts is more than enough.  

[Kenna]

I loaded system defaults in the bios but it didnt do anything.
I downloaded Hardware monitor to see what my psu voltages were. 3.3 and 5v seemed normal even the 12v was even though it droped down to about 11v at one point. I tried launching furmark to see if the extra load on the psu would affect voltages however it shutdown immediately. I also turn off Anti-Surge but it did nothing, instead of suddenly shutting down my pc fans (case and graphic card fan i think) go really loud and my screen blacks out. 

[Kenna]

Well I seem to have fixed the problem. I reset the CMOS and unplugged and replugged all the cables leading to the PSU as well as on the Motherboard. I think it was replugging the cables that actually solved the problem not the CMOS.  

[Akolyte]

Well I seem to have fixed the problem. I reset the CMOS and unplugged and replugged all the cables leading to the PSU as well as on the Motherboard. I think it was replugging the cables that actually solved the problem not the CMOS.  

You should definitely run a stress test on your cpu, graphics card and memory now and see if its stable.  Maybe some of your cables were just plugged in wrongly.