I just recently built my first PC. Super excited, however, I am running into issues after it has been powered off or left alone for the night. The moment I power it on, all the fans power on, the AIO boots up and the RAM lights up, then it shuts off and turns back on about 2-3 times until I see the motherboard LED finally turn on and the systems boots. This has been extremely frustrating because I can't seem to get any real help from all the places I've been referred to. 

The crazy thing with all of this is that I actually can use it all day without any issues after the cycle and have a great experience. It just happens when I let sit for a few hours with shut off it fails again.


Troubleshooting I have done includes-

Removed RAM down to one stick and rotated each stick throughout the board.

Removed GPU and utilized only onboard graphics

Selected (SINGLE) on my PSU instead of (Multiple) 

Replaced Thermal Paste on CPU (no difference in temp or performance)

Removed all of the cables and re-inserted them to ensure solid connection

Removed all third party drives, docks and adapters

Checked Bios and updated Bios to recent update


Here is what I am using

Lian Li Dynamic 011 XL Case
Z490 Vision D motherboard
Corsair HX1200 80 Plus Platinum power supply
64GB Corsair Vengeance Pro 3200 unbuffered RAM x4 16GB sticks 
Sapphire Radeon Vega 64 GPU
x2 1TB Samsung SSD's M.2 in PCIE slots
and a NZXT Kraken Z73 AIO Water cooler

The only issue I have is that it only does this after hours of not using. I cannot duplicate the issue once it's booted because it just seems to work fine.

Any help on this would be amazing..

Thanks in advance