I realized I should have attached a few more details to the OP
I built this PC about 3 months ago and had zero issues for about a week of use and then black screen restarts started happening seemingly randomly. I tried many steps and eventually plugged my PC into a wall as opposed to a power strip and that fixed the issue for about 2 months. About 2 weeks ago, the black screens started happening again and plugging it into the wall did not work this time. The black screens are totally random, I can go 2 days without one and then not even 10 minutes without one the next day. I took it to a professional and he said that he cannot say for sure but thinks its caused by me daisy chaining one of the 2 PCIe cables into the 12vhpwr adapter for the 4080 because I had to. This didn't make much sense to me as when I built the PC, it originally had my old graphics card, a GTX 970 in it and these black screen crashes have happened on both cards. I contacted Corsair to get a 3rd PCIe power cable but because I am not confident this will fix the issue I am trying to troubleshoot further. My temps are great, I have a Kraken Z73 cooler and the CPU will be around 60-70C while gaming and the GPU around 60-65 but usually not that high. Me and the professional both ran memtest, he said all my hardware passed but I don't think he dove super deep into it, he just cleared my memory for sure. I took out my old SSD and just had my one I bought new in there to see if that helped. I just recently took out all my cable extensions and just had the cables going directly from the PSU to where they needed to go. I have installed latest BIOS, drivers, and I sincerely do not think it is a software issue as it has happened right out of the gate on fresh windows installs and even in BIOS.
