Computer not shutting down fully

[Brains 001]

So I have had this problem for a month or two and havent had the time to do anything about until now.

 

Basically when shutting the computer down it works as normal till the point where the drives shutdown, however the fans and case lights are still on. At this point I found that holding/pressing the power and reset buttons on the case or motherboard did nothing and the only way to switch it off was to switch off the power supply.

 

I recently did a fresh install which now allows me to hold the power button to switch it off a completly after the drives have stopped.

Whether the pc is on or nearly off, the reset button is a bit temperamental and somtimes works or sometimes does nothing. If it does work it is usually a very delayed reaction(i.e. 5 - 10 secs after pushing the button)

 

I also found that before the fresh install, at the point it was supposed to load windows it would often just stick at a black screen and do nothing and I would need to switch off the PSU and try to boot again(but since the fresh install I have not had this problem).

 

Everything appears to be connected correctly I have checked. I have also made sure drivers are up to date but this has had no effect.

 

Any ideas?

 

 

Specs :

Motherboard - MSI Z77A-GD80

CPU              - i5 2500k @ 4.2GHz

CPU Cooler  - Corsair H100i

GPU              - EVGA GTX680 4GB

PSU              - Corsair AX860i

HDD              - WD 3TB Caviar Green

                      - WD 640GB Blue

                      - Samsug 840 EVO 120GB (this was added with the fresh install)

OS                 - Windows 8

[Ookami]

Does graphic card or CPU fans spin also?

[Ex0Thermic]

what windows are you running ? and have you run any virus scans ? 

also have you tried turning off automatic update, disabling hibernation, changing your power options, checking to see if your pc is overheating in any way  and finally updating your bios if not already the latest version ?

 

[Norwegiantweaker]

Sounds like something is directly connected to the psu outlet and not shutting down when you power it off.

[Ex0Thermic]

Sounds like something is directly connected to the psu outlet and not shutting down when you power it off.

i had the same thought but not sure. i know some psu's have a cool down feature where they will run for 2 or 3 min after you turn off the pc to cool down.

[Norwegiantweaker]

i had the same thought but not sure. i know some psu's have a cool down feature where they will run for 2 or 3 min after you turn off the pc to cool down.

on an old build i had maybe 10 years ago this happened to my case fans because they were molex ( str8 into the psu )

[Brains 001]

Does graphic card or CPU fans spin also?

Yes they do

 

I will try and find some time this weekend to try it with a different psu. I have an NZXT Phatom 820 cse which has fan control which uses molex for power but it was working fine for ages.

[Brains 001]

OK so here is where I am at with this

 

I swapped out the power supply for the old one I had. This made no difference.The system still ends up with the drive off but lights and fans all spinning

 

I have reconnected my current psu (AX860i) and made sure that all connections are secure. This again has had no effect.

 

Atthis point I believe it is a problem with the motherboard.

 

Any thought on how to proceed?

 

Edit: Forgot to do this a while back. A bios update fixed it