Home Build: Turns on for Split Second, Shuts Off

AngieBee

Honorable
Jan 30, 2014
6
0
10,510
Hello,

I recently built a new PC. All of the parts are brand new. It has been working without issues for a few weeks, when yesterday it shut down when I plugged a USB Thumb Drive into the front of it to transfer some files. I did move the PC while I was doing something, so I can't tell you if it shut down when I put in the thumb drive or I moved the PC.

When I hit the power button, the fans on my GPU and CPU fan will spin for a split second, then you can audibly hear the PSU 'clicking' off. It's not a sound that seems bad, just like it's tripping. The green light on my MOBO stays on, so I'm not sure if this is a sign that the MOBO is okay or not.

I removed the power switch from the MOBO, and pushed the start button on the MOBO, and the same thing happens. I removed RAM, the Video Card, and even swapped CPU fans -- same thing.

At that point, I suspected a bad PSU. I changed that out with a different brand and higher wattage (850), and the same problem occurs.

I'm at a loss about what to try next. I get the sneaking suspicion that I have a short somewhere, possibly moving the PC caused the MOBO to make contact with the case, leading to a grounding (?) problem.

Here is my build:

Cooler Master HAF 912 Case
CORSAIR AX series AX760 760W ATX12V / EPS12V
EVGA SuperClocked w/ ACX Cooling 02G-P4-2774-KR GeForce GTX 770 2GB 256-bit GDDR5
Intel Core i5-4670K Haswell 3.4GHz LGA 1150 84W Quad-Core Desktop Processor
ASUS Z87-A LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)

I would appreciate any insight.

Thank you,
Ang
 

Half Life

Honorable
Sep 2, 2013
545
0
11,160
thats a possibility, but try this easy one before you begin your diagnostics on possible shorting.

the usb port on the front of the case connects to the motherboard header using some wires. remove them from the board scoket and power up.
 

AngieBee

Honorable
Jan 30, 2014
6
0
10,510
Hi HL,

That is a good idea, and I neglected to mention that I tried this as well, and I'm having the same issue. I know the USB ports (on the front) worked in the past, as I have had things hooked up to it.
 

Half Life

Honorable
Sep 2, 2013
545
0
11,160
ok, the motherboard is fixed to the frame using screws and standoffs and I would check if they are intact.

edit: if you already did this, then here is what i'd recommend. disconnect all non-essential hardware such as optical drive, graphics card, secondary hard drive etc., until you have the bare minimum the board + boot drive.

check if that works.
 

bjaminnyc

Distinguished
Jun 17, 2011
621
0
19,060
Do you have a large CPU cooler? Just thinking along the lines of moving the case causing the issue. I know its rare and likely difficult to do, but was there enough inertia from moving the case to cause the MB to bend?
 

AngieBee

Honorable
Jan 30, 2014
6
0
10,510
Thanks guys, I'm going to try removing everything and checking the standoffs to see what might be happening. I have read some ASUS boards have had some issues with contact shorts.

bjaminnyc -- yeah, the cooler is a Cooler Master Hyper 101i. It's large, but I don't know if it would be considered large by enthusiasts. Subjective, I suppose.

I definitely didn't slam/drop it down, but not as gently as I should have, either, and my floor is wood. It's unfortunate than I was moving the case at the same time I had put the USB stick in, so I didn't notice right away which caused the issue (had music on). It's not until I looked up at my monitor that I noticed the PC had shut off.

I built this PC to run SolidWorks for projects I have to complete, so I'm a bit under the gun, and tracking down this issue is testing my patience. =*(
 

AngieBee

Honorable
Jan 30, 2014
6
0
10,510
So, I found the polyswitch, or resettable fuse, but I'll be honest, I don't know what I'm supposed to reset. It's just a green, flat area. I have tried to look online, but all I see is ASUS marketing about, nothing about what to DO, including in the manual. It's possible I'm missing it.

Help!
 

AngieBee

Honorable
Jan 30, 2014
6
0
10,510
Okay, I figured a quick update so nobody is chasing after false things.

I removed things one at a time and kept trying to power up, all the way down to the front panel wires. It would trip until I was down to my MOBO, PSU, and PSU Connected to the CPU and MOBO. Still tripped. Removed the power to the CPU...and it started working (CPU Fan kept running), PSU didn't autoshutoff.

Now I'm going to check if the CPU came loose somehow, which would seem impossible (hope I'm wrong) since it's clamped down good.