Please help...

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Hi!

So last night I turned my PC off the normal Windows Shutdown way. All was fine, been playing BF4 all day, no signs of "madness" or anything.

Booted it today and it just sits there, no HDD activity, no dvi signal, no power going to my USB keyboard, deathadder or headset.

As a result it is making it hard to figure out what is wrong. No burning smells, just doesn't work? No motherboard LED signs that I can see, but I haven't taken it out properly yet as it is cumbersome and in a bad place as far as the connectivity wires are concerned.

Does something instantly sound like the culprit?

Full spec;
Corsair Carbide 400R
Intel [email protected] (has been 100% stable for months, but I can't get to bios to reset the OC to try that (funnily enough in the past I tried to reset the OC to standard all round settings and it would not POST, it only POST's if it is overclocked).

Asrock Motherboard, can't remember the full specific model number.

2x8GB Patriot DDR3 ram, not sure on the model of that either.

Asus 690 GTX - totally standard no OC.

Noctua DH-14

Samsung 840 PRO 240GB

4 WD 2TB Green's

Corsair 850w non-modular PSU

Windows 7

Gigabyte Osmodium Mechanical Keyboard

Razer Deathadder Black Edition

Plantronics 780 headset

I think that is everything.

To me it sounds like PSU but if that was the case it would not even power on? So it could be the motherboard? Cpu, gfx, ram etc seperately would not affect the lack of DVI output or USB power would it?

Totally stumped...this is £2500 of equipment so kind of disappointed if something has gone bang?

Many Thanks.
 
Ok I will try both. I need to add some more detail too:

The power button lights up and stays on, and all of the fans in the system come on also. So it is not the usual "everything dead" scenario, which makes it even harder to diagnose.

I am wondering if running a GTX 690 has taken its toll on the PSU over time. Unfortunatly I have nothing here to test it with, not even a volt meter.
 
Sounded like cpu or mobo, but i have also seen it where unplugging the power from the wall will help a failing psu work again, without spares to test it becomes more awkward to narrow down.
But good its currently working.
 
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Maybe I should just upgrade the PSU anyway then?

It is going to be a pain swapping it over, it took 4 hours to cable manage my case and it is not modular (the new one will be!)
 
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