System powering on then cutting out seemingly before POST

Thoraisius

Honorable
Dec 13, 2013
4
0
10,510
The computer in question is composed of:
Motherboard:
ASUS SABERTOOTH Z87
CPU:
Core i5 I5-4670K
Graphics card:
eVGA GeForce GTX 760 Superclocked w/ ACX Cooler (2 GB)
PSU:
XFX Core Edition PRO650W
RAM:
Kingston HyperX blu 2 x 8 GB
HD:
Samsung 840 EVO MZ-7TE250 250 GB
along with an old 500GB HDD

I built this computer about 2 weeks ago and it's second time i'm running into this issue. First time was the day after i put the computer together (note that prior to both times this happened the computer booted fine) I then tried to figure out what was causing it but then it suddenly just started working again and i figured heck it working so no need to look any further. Now however the problem has resurfaced and this time it doesn't seem to just want to go away.

What specifically happens is when I press the power button on the PC everything seems to power on for a second but then everything cuts out seemingly before POST which means I currently have no feedback from the MB as to what could be causing this issue.

So far I've made sure that all the cables and components are firmly in their sockets and aside from that I've tried running with only a single memory stick socketed in.

Hoping there might be someone with some insight as to what might be causing this
 

Vic 40

Titan
Ambassador
It's probably not what you want to hear,but rebuild the pc completely.Look very carefully at the placement of the stand offs and look again good at the cables etc.
Try it even first out of the case to see if it works there.
It looks like a power issue to me so if the above doesn't help try with another psu if you can.

 

jb6684

Distinguished
Yeah, Vic40 has it, re-build breadboard style outside the case...
- don't install the GPU, run off the on-board video...
- don't connect any peripherals (HD, DVD, ...) you won't need them to boot up...
- don't connect any cables to the motherboard other than 24 pin and the 4/8 pin CPU power....

If that boots up to the BIOS screens, start adding things back one-by-one.... Boot drive 1st.
 

Paperdoc

Polypheme
Ambassador
Agree with Vic 40.

Remember to check the connection of your CPU cooler fan to the mobo port. Some mobos check the speed signal coming from that fan at all times. If there is no speed signal (loose connection, maybe), that is interpreted as a fan not running. Without waiting for the CPU to overheat, the mobo will shut down immediately as a protective measure.

There's a way to disable this feature if you have it, and if you know there's a good reason not to monitor that fan's speed. But it is a good protection to have, so don't disable without reason.