PC cpu overheating problem

I’m at my wits end and am begging for help from anybody who can provide it. My prebuilt pc is only a little over 3 years old. The cpu overheats pretty much as soon as I boot up. Over time I noticed idle cpu temp would go up from 70c to 75 then eventually to 80. Now it idles at 85c at first boot up, reaches 90+ within a couple minutes and automatically shuts down. At first I thought it was a dust problem, cleared the dust off all fans, especially the cpu cooler. Then to be extra sure, I wiped off the old thermal paste and reapplied it. Needless to say, it didn’t work. I’m thinking the next possible reason is a faulty cpu cooler but thought it wouldn’t fail after three years only.

Another thing I noticed is that the gpu’s fans will start spinning when I turn the computer on, but as soon as I get to the Home Screen, the fans will stop spinning. Is it possible a faulty gpu will lead to the cpu taking on extra stress of displaying graphics, leading to higher temps? I can’t keep the computer on long enough to update drivers.

Thank you so much in advance!

Quick edit: I was able to quickly open device manager and confirm that the computer recognized the rtx2070 was plugged in

Part list: (prebuilt bought in 2019, only thing I did was add an extra ssd back in 2019)

Case: AeroCool Cylon RGB Gaming Case

Processor: AMD Ryzen 7 2700X Processor (8x 3.7GHZ/20MB L3 Cache)

Processor Cooling : iBUYPOWER 120mm RGB Liquid Cooling System

Memory: ADATA 16 GB [8 GB x 2] DDR4-2666MHz

Video Card: GIGABYTE Windforce RTX 2070 - 8GB (VR-Ready)

Storage: 500 GB Western Digital Blue SSD

Motherboard: ASUS TUF X470-Plus Gaming

Power Supply: 600 Watt - Standard 80 PLUS Gold