New ASRock MOBO failing to boot, strange power symptoms

[Julius484848]

Hi,

I'm trying to build a new PC but unfortunately its failing to start up after initial success.

After being on for around 30 mins initially, now when I try to turn the system on, it powers on for seconds (fans, LED starts posting), and then shuts down. When the PC turns itself off he MOBO LED lights rapidly and sporadically flicking on and off like the power is struggling to reach the MOBO.

Also strangely it seems that when I leave the PC off for an extended period of time (30 mins - 1 hour) the PC will last for longer (2-3 mins). However when I try turning it on straight away it won't show any signs of life.

Could this be something to do with the MOBO battery?

I've built the PC as a Breadboard, (so out the case, just the MOBO, CPU and power plugged in)

MOBO: ASROCK Extreme 4
CPU: Intel i5 4590
PSU: Corsair 650W

Any help is much appreciated, I can't find any other threads with similar problems so it would help to get any knowledgeable persons thoughts.

 

[udg]

Is the Heatsink and Fan on the CPU fitted properly?

 

[Julius484848]

I've triple checked the heatsink and it seems to be fitted correctly.

 

[alexoiu]

What CPU cooler using?

 

[Julius484848]

Just the stock intel one that came with the i5 4590

 

[alexoiu]

Can you test different power supply?

 

[Julius484848]

Yes, powersupply works in my 2nd PC, and 2nd PC power supply gives same symptoms in the new build PC. So I think I can rule out the PSU as the issue.

 

[alexoiu]

Right. Then I suggest RMA-ing both motherboard and CPU. I suspect the board, but... just to make sure.

 

[Julius484848]

Well I'll probably just send it back to the online retailer rather than RMA.

Does anyone have any idea what the strange symptoms of the LEDs flashing or the fact that it works for longer if its been off for longer?