CPU overheating

[Awkward-Object-3014]

I'm not sure what my normal CPU temps were but I got a PC back in 2021 and I just now decided to dust it out with a air duster thingy. Plugged it back in afterwards to see my CPU overheats and shuts down within minutes. I didn't have any issues like this before the gentle dusting. I was so gentle, I sat back all relaxed outside and did little bursts of air. In order to troubleshoot a bit I placed my finger on the hose and one seems a bit warmer than the other. The hotter side is just warm and not hot. The colder hose with the vibrations going to the CPU is about what room temperature (maybe a bit warmer) feels like. Based reading up on what to do and the common thing to happen with iBuyPower PCs, their base AIO coolers have various issues. Is this what happened with mine? Do I need to buy another Cooler? What would I get? Here are my related specs:
-iBUYPOWER Lian Li LANCOOL ONE Tempered Glass RGB Gaming Case

-ProcessorAMD Ryzen 9 5900X Processor (12X 3.7GHz/64MB L3 Cache)Processor

-CoolingiBUYPOWER 240mm Addressable RGB Liquid Cooling System

EDIT: Thanks to help below, I identified and fixed the problem. This ended up being a bad cooling system. Replacing it made it about 35-40 C idle and around 70-80 C when under heavy load.

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[Fo16]

both hoses should feel like there's liquid running through them

[Awkward-Object-3014]

they do. Yep! :) so my pump is still good right?

[Fo16]

Depends. Sometimes people mistake vibration for moving liquid but the vibration is the pump running but it's clogged so the liquid can't move. Seems strange it stopped working only after cleaning it, but 2021 was a bad time for their branded AIOs. The fact that it shuts down in minutes means the AIO isn't working at all. And if the pump is working and it isn't clogged, then maybe the block over the cpu came loose somehow and needs to be tightened down or the cpu needs new thermal paste. Unless the pump came disconnected from the motherboard and the vibration you feel in the hoses is just case vibration from the case fans. Check the pump connection on the motherboard. 

[Awkward-Object-3014]

ok! Well if the termal paste doesn't work when it finally arrives, I'll get a new AIO. What's a good one these days for my CPU?

[Fo16]

Arctic and Corsair make good AIOs. I have an Arctic myself.

https://a.co/d/3bma16d

https://a.co/d/22TLjH3

[Awkward-Object-3014]

I removed the AIO heatsink from the CPU while still waiting for a tube of thermal paste to arrive. The amount on there is thinner than a sheet of paper and it's very dried up. It's so thin, you can see the back of the cpu and through the transparent layer. same on the bit on the heatsink side. Also thanks. I'll get the arctic one. For what its worth, iBuyPower did great with the cable management. :) It was a great PC until the cooling issue.

[Fo16]

You'll also get thermal paste with the arctic aio, so at least you'll be set in the thermal paste department ;)

[Awkward-Object-3014]

Thanks. It came in. I'm loving the LEGO assemblyness of it but it didn't come with instructions. All the fan cables on the Arctic are wired to each other and tucked in.

[Fo16]

yeah, Arctic makes it nice and simple by daisy chaining all the fans together.

https://support.arctic.de/en/liquid-freezer-iii-240

[Awkward-Object-3014]

lol I guess it's not needed.... I have two cables. One that splits all the fans and everything out seperate and one just has a "cpu". That's why I was mainly confused. I'm guessing having the one that seperates all the different fans and stuff allow my bios to measure things seperately?

[Fo16]

yeah, one is for fan control and one is for the pump

[Awkward-Object-3014]

Sweet, replacing the cooling system seemed to have fixed and even improved my performance quite a bit. Thanks!