New build turns off after 1 second, constant reobooting

GizmoTheMogwai · 29 Sep 2011 at 21:59

I bought the following parts last week

Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - Retail with FREE TrackMania 2 Canyon PC Game £144.99 1 £144.99

Sapphire ATI Radeon HD 6870 1024MB GDDR5 PCI-Express Graphics Card with FREE DIRT3 & Deus Ex PC Games £112.49 1 £112.49

Gigabyte Z68AP-D3 Intel Z68 (Socket 1155) DDR3 Motherboard £71.65 1 £71.65

Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A1600C9) £21.66 1 £21.66

Upon booting it started for 1 second (all the fans started) then switched off. I had a previous OCZ ModXStream Pro 600w Silent SLI Certified Modular Power Supply that I had thought was failing, so I have ordered a new one.

Upon installing the new PSU, I get exactly the same problem. I am installing it without the CD drive, Hard drive or GPU plugged in.

Please help? I'm at the end of my tether here

stulid · 29 Sep 2011 at 22:01

Have you plugged the extra power connector into the motherboard near the CPU socket?

Does the 6870 have both 6pin PCI-E connectors in it?

Can you try a clear CMOS?

GizmoTheMogwai · 29 Sep 2011 at 22:05

stulid said:
Have you plugged the extra power connector into the motherboard near the CPU socket?

Does the 6870 have both 6pin PCI-E connectors in it?

Can you try a clear CMOS?

Yes

GPU not connected

Already have done before putting new PSU

RJC · 29 Sep 2011 at 22:06

Try running the motherboard external to the case, you might have a short and try with only one memory module in various slots.

GizmoTheMogwai · 29 Sep 2011 at 22:07

RJC said:
Try running external to the case, you might have a short.

Can you explain how I would do this, please?

I would also like to add that at one point when I first built it last week, it was running perfectly into Windows (without GPU)

RJC · 29 Sep 2011 at 22:09

Place the motherboard on some card or non conductive surface.
Connect all power and peripherals to run the system, you should have enough length to connect the case power switch and cable from the PSU without removing this.

GizmoTheMogwai · 29 Sep 2011 at 22:12

I also remember one morning, turning it on to hear whining, and since then this constant rebooting has happened.

I had suspected the whining was caused by the PSU...

I will try this out case

GizmoTheMogwai · 29 Sep 2011 at 22:20

It's out of the case in the box, what connectors should be in for this?

95thrifles · 29 Sep 2011 at 22:22

those you'd connect normally
As Stulids alluded to, it sounds like mobo has been shorting against the case, if thats what has happened, i.e. it works fine outside the case, ensure you have all standoffs fitted, if you do retry and if problem persists check board for warping

stulid · 29 Sep 2011 at 22:22

GizmoTheMogwai said:
GPU not connected

Can you plug this in please. And hook the monitor to the card and not the rear panel.

Hyburnate · 29 Sep 2011 at 22:23

24 Pin
8 Pin
Errr I think thats it xD.
Try with one stick of RAM first, if it turns off after a sec, try another.

Edit: Did you apply thermal paste? What CPU fan are you using?

GizmoTheMogwai · 29 Sep 2011 at 22:24

I can plug the two power cables from the PSU.

I can't plug all the tiny cables for HDD leds, etc or hard drive.

Hyburnate · 29 Sep 2011 at 22:25

stulid said:
Can you plug this in please. And hook the monitor to the card and not the rear panel.

Surely it would still POST even if one of the connectors on the mobo was faulty?

GizmoTheMogwai · 29 Sep 2011 at 22:25

Hyburnate said:
24 Pin
8 Pin
Errr I think thats it xD.
Try with one stick of RAM first, if it turns off after a sec, try another.

Edit: Did you apply thermal paste? What CPU fan are you using?

Yes

Hyper 212 +

It had been running perfectly on stock before the whining.

stulid · 29 Sep 2011 at 22:25

GizmoTheMogwai said:
It's out of the case in the box, what connectors should be in for this?

Ooo your already pulled aprt. ok.

The board needs both power cables.

Use a single RAM stick and HDD.

Just use a screwdriver to short the two pins briefly that the cable from the case goes to called "POWER SW"

The CPU fan is spinning when it turns on?

Hyburnate · 29 Sep 2011 at 22:29

Was it working after you installed the Hyper 212?

GizmoTheMogwai · 29 Sep 2011 at 22:30

stulid said:
Just use a screwdriver to short the two pins briefly that the cable from the case goes to called "POWER SW"

The CPU fan is spinning when it turns on?

Sorry, completely lost you there...

My Mobo is in a box and connected to 24 pin and 8 pin
The CPU and heatsink is in.

stulid · 29 Sep 2011 at 22:32

To get the pc to switch on when in the case, you press a button on the front.

All this action does is momentarily "short together" the two pins this cable connects to at the bottom edge of the motherboard.

replicate this action with a screwdriver head or needle nose pliers.

Hyburnate · 29 Sep 2011 at 22:34

GizmoTheMogwai said:
Sorry, completely lost you there...

My Mobo is in a box and connected to 24 pin and 8 pin
The CPU and heatsink is in.

Have you plugged in the Heatsinks cable into the CPU Fan Header?

Get a plastic handled screwdriver and press the prongs that are for the Power Switch for around 2 Secs then take it off.

GizmoTheMogwai · 29 Sep 2011 at 22:34

So I need to remove the power switch cable from the case?