That ring is the mount for what is probably an aftermarket cooling fan.
If there are not screws visible at the top, try checking the other side of the mainboard (it will have to be removed from the case likely).
Ich versuche die CPU zu entfernen.
Was ist das schwarze Plastik rund um CPU und wie kann man es entfernen?
That ring is the mount for what is probably an aftermarket cooling fan.
If there are not screws visible at the top, try checking the other side of the mainboard (it will have to be removed from the case likely).
Looks like the cooler bracket - usually fastened underneath.
You'll probably have to take out the entire motherboard to get to it.