PC turns on then off instantly

dannyroose2001 · Dec 11, 2017

Hi. I usually leave my PC on overnight while it does things for games and i woke up this morning to see it turned off. I turn it on and the PSU ticks in then off instantly. I hear one tick, all fans on for half a second then off.

I got this pc at the end of 2014.
Specs:
i7 4790k
GTX 980
12gb ram (x3 4gb)
MSI Z97-G55 SLI
Cooler master V750

Would appreciate any help as i don't want to lose this pc...

Barty1884 · Dec 11, 2017

I'd clear your CMOS first of all.

If that doesn't work, remove the GPU and see if you can still successfully boot using the onboard graphics only.

dannyroose2001 · Dec 11, 2017

I've shorted the CMOS. Still ticked on then off. Took gpu out and now. Its not even ticking on

Barty1884 · Dec 11, 2017

Without the GPU, nothing is happening at all? No fans/lights etc?

dannyroose2001 · Dec 11, 2017

Yeah. To clear cmos it said to short the pins so i used a screw driver after removing the plug. Didn't do anything. I tried taking out the battery and holding power button for 15 secs, nothing. There is now no GPU and one ram stick and no lights or fans turned on at all while doing these.

Barty1884 · Dec 11, 2017

Did you hold the power button to drain the capacitors before attempting to short the jumper?
Shouldn't cause an issue, but still, a possibility.

To clear the CMOS (other than the jumper), you have to remove the battery and wait. 10 minutes ideally, not 15 seconds.

dannyroose2001 · Dec 11, 2017

Update, shorted it once more and now. Its ticking once and then turns off again

dannyroose2001 · Dec 11, 2017

Okay I'll try waiting 10mins and report back

dannyroose2001 · Dec 11, 2017

Waited and still ticking on and off like before without the gpu

dannyroose2001 · Dec 11, 2017

https://streamable.com/vj3t3

Here is a video. Excuse the dust.

Barty1884 · Dec 11, 2017

Hmm, odd. Honestly, I'm not sure. good quality PSU, so *shouldn't* be that (but possible).

Since you have an AIO, I'm wondering if the pump has failed..... might trigger these symptoms, although I'm not convinced.

Could you connect a fan (rather than the pump) to the CPU_Fan header? Wouldn't suggest running like that, obviously - you wouldn't get far.
BUT, if it allows the system to boost better/further, we might be on to something.

dannyroose2001 · Dec 11, 2017

There's no fans i can connect to that slot. The top can is wired round the back into another cable and the bottom fan for the pumps cable won't go that far

dannyroose2001 · Dec 11, 2017

Is it possible I have to replace the thermal paste? I haven't changed it since i bought it

Barty1884 · Dec 11, 2017

While it *might* help, old thermal paste isn't going to be the difference (overnight) between a working and non-working system. You would've experienced temperature increases over time, throttling and (potentially) forced shutdowns long before old, drying out thermal paste would result in a failure to post.

dannyroose2001 · Dec 11, 2017

Welp, I'm stumped then. I've no idea what to do apart from getting a new PSU then of that fails, get a whole new system which i won't be able to do within the next months.

dannyroose2001 · Dec 11, 2017

Bump...

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