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Asus Sabertooth Z77 and Corsair HX750 works fine until computer shuts down and won't start up

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  • Sabertooth
  • Computers
  • Corsair
  • Motherboards
Last response: in Motherboards
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August 21, 2013 1:02:00 AM

Dear All,

I have an Asus Sabertooth Z77 with a corsair HX750 PSU and had it for over a month which includes an SSD and a couple of hard drives it also has an EVGA 660SC graphics card too.

For a while my computer has been working fine and then all of a sudden my computer just shuts down.

When I tried to power up again the computer won't start up, no fans moving no hard drive spinning.

I do however know power is getting through because on the motherboard there is a green led light that indicates power supply to the motherboard and after switching on the switch on the case I can see other lights from the lan port and even the bios flash button when pressed.

I've tried everything but don't know if it's the PSU or the motherboard at fault.

I'm annoyed that barely two months its effectively dead and would like your help please.

More about : asus sabertooth z77 corsair hx750 works fine computer shuts start

a b V Motherboard
August 21, 2013 1:30:53 AM

Did you recently change anything? Changed some BIOS settings or added some other internal device or anything else?
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August 21, 2013 2:12:55 AM

No. The last item installed was the graphics card barely a month ago.

What I can't understand is how it first shut down unexpectedly and second why I can tell power is going through but not spinning the fans or the hard drives.

I still think it's a PSU fault but if its a motherboard fault then I'm in serious bother.
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August 21, 2013 2:14:01 AM

I've seen cases where the computer randomly shuts down but never have I've seen a computer just "die" right in front of me and never start up again
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a b V Motherboard
August 21, 2013 3:02:52 AM

Does your PSU have some kind of self test button?

You can´t power it up again at all, right?
I´d try to completely pull the power plug, then perform a BIOS reset and see if that works.

If it doesn´t, try it with a minimum configuration of components.
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August 21, 2013 11:36:56 AM

PSU doesn't have a self test button and yes I can't physically start the computer at all. I've tried pulling the plug but can't seem to do a bios reset.

For the bios reset, is it as simple as taking out the battery and putting it back in again?
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a b V Motherboard
August 21, 2013 2:04:30 PM

Pretty much. Most people suggest to keep it out for a couple of minutes before putting it back in.

In my experience 20s or something like that has always been enough.
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Best solution

August 23, 2013 2:08:59 AM

I've tried to reset the BIOS but it still does not respond. I am really not sure if it's actually the PSU or the motherboard and I have a feeling the motherboard may be the one to fault which would be a real pain.

I was wondering if anyone else has had this issue before in that all of a sudden the computer just shuts down and never starts up again.

I know that in about 2 weeks I maybe able to find out in testing the PSU and the motherboard. If the computer runs with a different PSU then I know it's the PSU at fault, if not then I may have to use my manufacturers warranty to get the motherboard sorted.
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November 26, 2013 5:28:21 AM

have you done any over clocking at all??
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November 26, 2013 5:35:46 AM

look I don't know if this has any thing to do with your problem but I have just fix a computer that was shutting down and not starting up and I found out that a friend of there's had changed the cpu and did not reapply new thermal past so if it is an older computer you mite look at that as a cores and if it is all dry then clean it off and reapply new thermal past and see how it go's then it mite save you a lot of money
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