Help with PC not powering on

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lokhor

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#154699 4-Nov-2014 18:49

Hi all,

After doing some windows updates I rebooted to my bios to enabled virtualisation technology as I thought it might help with VirtualBox performance.

Unfortunately upon saving and attempting to reboot my PC turned off and will no longer power on at all.

The standby LED appears to be on but pressing the power button does nothing.

I have attempted unplugging and taking the cmos battery out as well as using the clear cmos jumper. Also tried taking the video card out and seeing if it would boot using the onboard video.

My specs are:

Intel Core i5 4670k
Asus Z87-C mobo
2x4gb gskill ripjaw ddr3-1600 ram
Geforce GTX 570
Enermax NAXN 650w psu
1x SATA DVD-RW
2xSATA Kingston SSDs
1xSATA HDD

Any help or ideas would be appreciated.

All comments are my own opinion, and not that of my employer unless explicitly stated.

saeran

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#1168745 4-Nov-2014 18:51

Sounds simple but have you tried shorting out your power connectors with a flat head screw driver (instead of plugging in using the power button)?

richms

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#1168749 4-Nov-2014 18:54

Unplug the AC power and leave it off for ages so that the protection circuitry in the PSU has time to discharge, and then try it again. The standby LED is powered by a secondary power supply so can come on even if the main PSU is locked up.

Richard rich.ms

lokhor

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#1168809 4-Nov-2014 20:27

richms: Unplug the AC power and leave it off for ages so that the protection circuitry in the PSU has time to discharge, and then try it again. The standby LED is powered by a secondary power supply so can come on even if the main PSU is locked up.

Ok I am trying this now. how long is ages?

All comments are my own opinion, and not that of my employer unless explicitly stated.

lokhor

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#1168813 4-Nov-2014 20:29

saeran: Sounds simple but have you tried shorting out your power connectors with a flat head screw driver (instead of plugging in using the power button)?

I don't know if i am game for that. I am also unsure how I would do it as the power connector is connected to a header with the speaker, leds, reset button etc

All comments are my own opinion, and not that of my employer unless explicitly stated.

richms

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#1168834 4-Nov-2014 20:52

lokhor:
richms: Unplug the AC power and leave it off for ages so that the protection circuitry in the PSU has time to discharge, and then try it again. The standby LED is powered by a secondary power supply so can come on even if the main PSU is locked up.

Ok I am trying this now. how long is ages?

In the case of some dell monitors at my old work, overnight, but for PC's 5-15 mins seems to be enough usually

Richard rich.ms

Elpie

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#1168880 4-Nov-2014 21:33

Just to add to what Richard said - don't panic if it doesn't work after 15 minutes. I've had PC's that took a couple of hours. So, if it doesn't free the PSU take a breath and wait a little longer.

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lokhor

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#1169210 5-Nov-2014 12:44

I managed to get it to boot after waiting ages (overnight), unfortunately I didn't have my main drives plugged in and after turning it off again I have been unable to get it to power on at all!

What's more likely: that my psu is dead, or that my motherboard is dead?

All comments are my own opinion, and not that of my employer unless explicitly stated.

Elpie

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#1169213 5-Nov-2014 12:48

PSU is the most likely.

ckc

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#1169234 5-Nov-2014 13:29

^ If you have no power at all the first place to look would be the PSU, and having a look to see if any caps have blown on the motherboard.

My last failure to POST, last week, was dodgy 8 pin 12v wiring on a brand new Zalman PSU.

richms

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#1169242 5-Nov-2014 13:40

Usual cause for a shutdown that takes time to clear is the protection circuit triggering in the psu. Usual reason is caps going so it's noisy and triggering overvoltage protection.

Richard rich.ms

lokhor

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#1169442 5-Nov-2014 18:03

I tried the paperclip trick to try and get the PSU to turn on by itself. It didn't turn on at all. the PSU is under warranty so sending it back. hopefully it turns out to be that, otherwise its likely to be the mobo.

All comments are my own opinion, and not that of my employer unless explicitly stated.

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lokhor

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#1170989 7-Nov-2014 16:13

So I RMAed the PSU. Ascent were pretty great and the supplier sent me a new PSU already (it arrived just a minute ago).

I will have to install it when I get home and hope that my mobo is still working ><

All comments are my own opinion, and not that of my employer unless explicitly stated.

surfisup1000

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#1170990 7-Nov-2014 16:20

lokhor: Hi all,

After doing some windows updates I rebooted to my bios to enabled virtualisation technology as I thought it might help with VirtualBox performance.

Unfortunately upon saving and attempting to reboot my PC turned off and will no longer power on at all.

The standby LED appears to be on but pressing the power button does nothing.

I have attempted unplugging and taking the cmos battery out as well as using the clear cmos jumper. Also tried taking the video card out and seeing if it would boot using the onboard video.

My specs are:

Intel Core i5 4670k
Asus Z87-C mobo
2x4gb gskill ripjaw ddr3-1600 ram
Geforce GTX 570
Enermax NAXN 650w psu
1x SATA DVD-RW
2xSATA Kingston SSDs
1xSATA HDD

Any help or ideas would be appreciated.

I had an issue where I couldn't reboot my machine after a power cut -- really puzzling , so I unplugged everything and found that my powered usb hub was somehow preventing the system from powering on.The powered USB hub was feeding electricity into the pc via the usb port which seemed to confuse the bios ( i guess).

lokhor

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#1171074 7-Nov-2014 18:52

Ok I have installed the new PSU and all seems well so far!

All comments are my own opinion, and not that of my employer unless explicitly stated.