Morning - I've sent this to tech support as well, but will try my luck here as well:
Processor (CPU)
Intel® Core™ i9 Eight Core Processor i9-9900K (3.6GHz) 16MB Cache
Motherboard
ASUS® ROG MAXIMUS XI HERO: ATX, LGA1151, USB 3.1, SATA 6GBs - RGB Ready
Memory (RAM)
32GB Corsair VENGEANCE DDR4 2400MHz (4 x 8GB)
Graphics Card
11GB NVIDIA GEFORCE RTX 2080 Ti - HDMI, 3x DP GeForce - RTX VR Ready!
1st Storage Drive
2TB SEAGATE BARRACUDA SATA-III 3.5" HDD, 6GB/s, 7200RPM, 64MB CACHE
1st M.2 SSD Drive
512GB INTEL® 760p M.2 NVMe PCIe SSD (upto 3230MB/sR | 1625MB/sW)

I'm hoping I've missed something obvious rather than there being a hardware fault.
I received the above order this morning - everything worked out of the box, although I did have to enter the BIOS briefly on first start to save it - though without making or saving changes. The fact the PC had to force me to do something like this makes me wonder if it is related to the issue I'm now having.
On loading Windows, the screen displays numerous purple 'dashes' all over the display, however mostly on dark backgrounds (and when booting as well). If I screen shot these they do not show, leading me to believe it may be a monitor issue. However, device manager shows the installed graphics card (GeForce RTX 2080 Ti) as having a fault; code 43.
I have uninstalled and re-installed drivers for both card and monitor and am still having the issue
Processor (CPU)
Intel® Core™ i9 Eight Core Processor i9-9900K (3.6GHz) 16MB Cache
Motherboard
ASUS® ROG MAXIMUS XI HERO: ATX, LGA1151, USB 3.1, SATA 6GBs - RGB Ready
Memory (RAM)
32GB Corsair VENGEANCE DDR4 2400MHz (4 x 8GB)
Graphics Card
11GB NVIDIA GEFORCE RTX 2080 Ti - HDMI, 3x DP GeForce - RTX VR Ready!
1st Storage Drive
2TB SEAGATE BARRACUDA SATA-III 3.5" HDD, 6GB/s, 7200RPM, 64MB CACHE
1st M.2 SSD Drive
512GB INTEL® 760p M.2 NVMe PCIe SSD (upto 3230MB/sR | 1625MB/sW)

I'm hoping I've missed something obvious rather than there being a hardware fault.