I have a self-build PC here (not built by me) that is performing very strangely. When it is turned on it starts up, everything turns and fans spin, but then it shuts down and the last code that I can see is 39, though I suspect there may be another that flashes quickly. It then goes throught the exact same process and shuts down with a code 39 again, but on the third boot, it stays on, however, there is nothing displayed on the screen and the Motherboard is showing a code 18 ... any ideas very welcome, please !!!
The MB is an ASUS ROG Maximus XI Hero Z390, I have removed the GEFORCE RTX2080 video card and gone to on-board graphics but it's made no difference.