Random shutdowns and not turning back on

[MCPottercraft]

Ok, hi. I am having horrible issues with my psu, well, I think its my psu.

Problem: My system will power down randomly and it tries to power up but it wont. It will power up for a half a second then power down, then 5 seconds later and it does this until I flip off the switch on the psu.

 

System Specs:

PSU: Corsair RM650

Motherboard: Maximus VI Impact

CPU: 4770k

RAM: Corsair Vengeance Pro 16gb (1866 I think but it dont have time to check)

GC: 780Ti DirectCuII

HDD: Barricuda 2Tb 7400rpm

SSD: 256gb (dont remember specs)

 

Problem details: Ok so I have figured out that I think it is my cpu power cable. I can get it to power up but it wont POST when the cpu power cable is not plugged in, meaning it not does power up and down in a loop. When I plug in the cpu power cable it just loops. Sometimes after unplugging both sides it will boot to Windows but it doesn't permanently fix it. And it was doing fine up until yesterday since the middle of March.

 

Problem 2(not PSU): When I set my ram to the xmp file Windows will POST but not boot to Windows, that is when my psu isn't having issues.

 

Notes: I posting this now so you guys can tell me what to test for tomorrow as I am not checking this till tomorrow. This is very urgent as I dont have a computer until this is fixed. And sorry for any mistakes this was typed on my phone.

[jonnyguru]

Some of the terminology you use is confusing. Instead of "turn on" and "flip on and off in a loop", use terms like "power up" and "POST" and "boots into the OS" so we can better understand the phenomenon you're experiencing.

[MCPottercraft]

Sorry about that, I changed everything to the same terminology.

[jonnyguru]

Ok. Without the AX12V power connector, the motherboard can certainly power up, but without getting that additional juice to the CPU it is very likely to not post. Most motherboards these days, that power connector goes directly to the CPU's VRM.

 

I would try the PC over and over again, each time with less parts. Take out the graphics card and use the CPU's integrated graphics, one stick of RAM at a time, each hard drive, etc.

[MCPottercraft]

Ok. Without the AX12V power connector, the motherboard can certainly power up, but without getting that additional juice to the CPU it is very likely to not post. Most motherboards these days, that power connector goes directly to the CPU's VRM.

 

I would try the PC over and over again, each time with less parts. Take out the graphics card and use the CPU's integrated graphics, one stick of RAM at a time, each hard drive, etc.

I understand that it cant POST without the cpu power cable but the problem is that it will power up but not POST with it unplugged but when it is plugged in it wont powers up for half a second then powers down over and over again. I stripped out the system all the way down to the MB, CPU, RAM, and the h100i and no luck. But when i removed all of my PSU cables and the PSU from the case and plugged the cables back in and I booted to Windows! So currently it is working (typing this on the system), but I am not sure if this is a permanent fix or just temporary. Thanks! :biggrin:

[MCPottercraft]

Quick Update: Just crashed but thankfully it booted to Windows.

I wasnt running anything intensive, only some steam games updating, 2 chrome tabs, software for headset and mouse, gpu tweak, cant remember anything else.

 

Edit: Crashed again, booted again. Very annoying. I also notice that the back end of the psu is hotter to the touch then the cpu part of the h100i, although that may be part of the zero rpm fan settings.

[jonnyguru]

This doesn't sound like a PSU problem. If your PSU undervolts, overheats, overloads, etc. It shuts down. It doesn't cause crashes, reboots, etc.

[MCPottercraft]

This doesn't sound like a PSU problem. If your PSU undervolts, overheats, overloads, etc. It shuts down. It doesn't cause crashes, reboots, etc.

Ok so the cpu power cable thing is on the motherboard side?

Thanks for helping me!