Laptop fan gets extremely loud after start?

I have a problem with my laptop. It is my laptop. I had no problems with it until recently and have had it for over a year now. However, it has suddenly become very loud after the start. After I started it, it runs normally for 20sec, after which it suddenly becomes very, very loud. I checked the BIOS and got 3600 RPM (I don't know if that's normal). In addition, "cooler" air flows out of the fan and it should apparently only be 33.6 degrees warm. In addition, no matter how badly I set it, CS: GO doesn't even run constantly at 30FPS. My laptop is not bad. (Maybe I ran it a couple of times in the evening if it worsens the laptop). Hope someone can help!

Intel Core i7700HQ

GeforceGTX 1050 Ti

Sounds like there's dust in the fins from the heat sink / airway…

I already had… Ne fluff as big as a fingertip… This slows down the circulation and the fan turns full throttle shortly after starting…

Only complete disassembly and cleaning helps… Most fans are stupidly located under the motherboard

With https://www.hwinfo.com/ you can have the temperatures of the CPU, graphics card and whatever other sensors displayed. Start that in pure info mode (otherwise you will be overwhelmed by all kinds of data) and check if any component gets / is particularly hot.

Hi, I'm less familiar with this area and at first glance I can't find the temperatures of the individual parts. Could you possibly help me there? (Incidentally, I selected System Summary at HWinfo because for some reason I couldn't choose the other one)

Hi! That sounds pretty promising. The thing is, it's a bit too risky for me to screw the laptop on like this. I'm just too afraid to break something.

That is also real fiddling with tiny little screws… Own experience

How about if you do a basic cleaning. Put the laptop back on and install only the most necessary. Then in the Autostart (Task Manager) issue programs that you do not need. Then you should open the laptop and clean everything. If you have pets or something, your fan can dust up quickly. I recommend you use a compressed air spray to clean your laptop. You can also use a vacuum cleaner. But be careful there. Never take a rag. Also look especially good at the fans. Clean the leaves so that they don't have to run so fast