How to open the laptop, I have to go to the fan?

Is an Acer Aspire 5742G

I once demolished the right hinge at the top under the screen, but so far everything was still functional

Yesterday he made a very loud noise when I moved him. Since I was interested, I moved it several times. At some point the noise was gone, but the fan stopped spinning. My theory: A particle in the demolished corner has come loose and got stuck in the fan.

I want to open it but it hangs on the arrow there at the connections. At some point I was shown how to open it with a magnetic card right there, but it doesn't work. How do I get it open, can I possibly also use a little bit of strength?

Thank you very much! I have high hopes for the Lords of Creation 😄

Here's how you can open it: