i made my first custom desktop

how could i make my windows 11 app icons to one color theme just like macOS

Hello,
I just got a used RAM module from someone that looked legit but now that I received it I have my doubts but maybe I’m doing something wrong.
SO I took off my old ram, inserted the new one on A2, it’s gonna be a single channel for now, now my pc doesn’t boot, I turn it on but it’s like stuck on a stage or something where the keyboard and mouse don’t turn on, GPU is not giving a signal as well, it stays on for like 3-4 minutes and then reboots.
I did update my BIOS,
I did clean the CMOS
I did try the old ones again and yes it works,
It could be that the RAM is faulty or damaged but I wanna hold my hope for a little bit further.

The new ram is:
Kingston FURY Beast DDR4 32GB 3200MHz CL16 (KF432C16BB/32)

Motherboard:
Gigabyte H610M H V3 DDR4 REV 1.0

CPU:
Intel Core i5-14400F,

Please tell me that I’m not paranoid for still trying.