Dnami

Hi, I recently built a new system for my sister using a Ryzen 5 3600 processor, MSI mortar B450 MAX, 16 gigabytes of Corsair 3200 speed RAM, Samsung 860 EVO, and RX 570. I can't get any programs/drivers installed smoothly without having a freeze (and when I turn off/on the monitor it's plugged into it gives me a green screen) or a BSOD (clock watchdog timeout). Does anyone have these issues as well? What kind of fixes are there?

Would the P350X case have enough length for a small pump/reservoir combo on top of the GPU? I was thinking maybe using this kit: https://www.ekwb.com/shop/ek-kit-s240

I recently bought a 2nd hand Corsair RM1000X for less than half the retail price (paid 600 Hong Kong Dollars, originally around 1300-1400 HKD). It looks like it's in good condition, and it passed the paperclip test. However, I don't have another motherboard to test the PSU on, so I was wondering if whether there are chances that a PSU can pass the paperclip test, and still not work in a system? Also, how likely are high end PSUs like a Corsair RM1000x likely to break in the use span of around 8 months (1st hand seller use)?