Boot up issue with system

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Joined
5 Oct 2007
Posts
620
Hello,
Up until 6 days ago my wife's gaming pc was working fine, at that time the build was.

Asus Z97-P motherboard
Intel CPU 4690
Galaxy 970 GTX
8gb Team Group Vulcan
2* 2tb Sata hard drives
Kave 5.1 digital
Windows 7 home premium.
PSU Corsair AX760i Professional
All resent updates to drivers.
No problems runs every game fine, except for known game crashes.
A good machine built at the beginning of 2015

Now last week I upgraded to windows 10 (I do not think this is a windows 10 issue)
At the same time I installed a 128gb ssd sandisk for the os.
At the same time I updated the bios to latest from the site, these were the only two hardware changes (I also cleaned the inside of the case with a hoover checked all connections nothing not in its right place)

Now the issue, power button will not restart the pc in the morning,pc comes on for 5 seconds fans speed up no graphics come up monitor stays in power save mode.
Holding power button in does not shut down pc it is a complete crash that only turning off power supply or unplugging fixes.
Plugging power cable back in or turning on psu switch and pc instantly starts up (disregarding power button on front of case)
Shutting down even for 30 mins during the day does not cause this issue it only happens if the system has been powered down for a long time.


What I have tested?
Prime stability
psu rails stability
memory check.

Pc runs fine all day even on taxing games only this night time issue happens.

Thoughts, when I flashed the new bios did it switch some settings in bios I do not know of (everything is on optimized defaults)
Did the new bios mess things up (no real reports I can see)
Is my graphics card or psu failing (Well the psu is a high end corsair and it worked perfectly till this change last week only 1 year old) graphics card seems fine.

Sadly I do not have a spare psu to check and even sending the psu back could be an issue due to this problem being so specific, as in the problem only appearing after a long down time.

Any bios settings I should turn off, any defaults that should not be allowed any advice is appreciated.
 
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