On going startup issues

[Billzz]

Hi guys,

I posted recently about startup problems I am having with my PC. When I start the machine, fans spin, graphics card lights up then it shuts down after a couple of seconds. It was working fine a couple of days ago - nothing was changed or upgraded - it wasn't even moved! Things I have tried to fix the problem:

* Swapping power supply.
* Swapping/removing memory modules.
* Tried different motherboard.
* Removed graphics card so it will use internal graphics.

I'm at a total loss as to what to try next. Could it possibly be the cpu gone bad? The machine is approx 1.5 years old specs are:

* i7 4770k
* 16gb Corsair vengeance DDR3
* Gigabyte z87x-ud5h
* Gigabyte G1 980ti
* Corsair tx750m power supply

Anybody any ideas what I can try next to try diagnose the problem?

 

[Billzz]

Yep, tried that several times on two different motherboards. CPU cooler is spinning properly on startup. As I've changed motherboards i've also changed thermal compound.

 

[Billzz]

@wedmonds i have a Alpenföhn Matterhorn heatsink using arctic silver paste. Freshly reapplied this morning while swapping motherboards. The CPU has never been overclocked. Motherboard doesn't even get to displaying a number - shuts down before then. No, I wasn't using it when it shut down, was using it fine the previous day, went to start it up and now constantly boot loops.

 

[Billzz]

OK quick update - the CPU has gone bad. I took it to a local repair shop, tried a couple of different processors - booted perfectly each time - RMA time!

Thanks all for the input - hopefully this will be sorted soon.