Brand new system built, not booting, restarts in a loop

[r-barker]

Hello!

 

I built a new system this week and it's not booting to bios, all that happens is the fans start up, along with the HDD for around 3-4 seconds then shuts down and automatically starts again (in a loop).

 

System Spec

Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - OEM

OcUK ATI Radeon HD 6850 1024MB GDDR5 PCI-Express Graphics Card

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

Seagate Barracuda 7200.12 500GB SATA 6Gb/s 16MB Cache - OEM (ST500DM002)

BitFenix Shinobi Gaming Case - Black

OcUK Swift 650W V2 Silent Power Supply

Arctic Cooling Freezer 7 Pro Rev 2 CPU Cooler (Socket 939/AM2/AM3/775/1155/1156/1366))

Kingston HyperX Blu 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (KHX1600C9AD3B1K2/4G)

 

I have taken the entire computer apart and tried again from scratch, yet I still get the same results. Everything is plugged in the correct places.

 

I also checked underneath the motherboard to see if there was any m/f screws pointing up which could have been causing it to cut out, however there was none.

 

All I can think of right now is that either the PSU is faulty, or the motherboard?

 

Any suggestions? Would be appreciated!

[KenB]

Hi and welcome to ExTS

 

All I can think of right now is that either the PSU is faulty, or the motherboard?

My initial thoughts too - erring towards the PSU.

 

Switch off at the wall - leave the plug in to maintain the earth / ground connection to the m/board.

 

Unplug all external devices ( Printer / router etc )

 

Strip the m/board of all cards ( RAM / NIC / Video etc )

Unplug the power to the hard drive(s) and DVD Drive(s)

Disconnect the drive data cables from the m/board end.

 

leave ONLY the 20(4) way connectors from the PSU connected.

 

Unscrew the m/board and sit it on a piece of card or folded newspaper to insulate it.

 

Switch on.

 

You should ( if you have an internal speaker connected ) get POST beeps.

The fans should run constantly.

 

If you don't get this condition then there is definitely a problem with either the PSU or the m/board.

If you have a multimeter or voltmeter I can give you a link to test the PSU.

 

Put the m/back on the stand-offs and switch on again.

If the restarting continues from this point there is a short between the m/board and the case caused by one of the stand-offs.

 

Put the components / connections back one at a time, testing after each, until you locate the cause of the problem.