I've used this syntax modprobe.blacklist=b43
Give that line a try.
Thanks for the suggestion but it didn´t function. Trying to boot the live cd ends up like always with a black screen. I don´t even reach any menu, only the first "Linux Mint" screen with the "blincking green points".
The boot parameter (modprobe.blacklist=b43) I added with Ubuntu, (which still functions on my laptop but without functioning Wlan).
Is there another way which i could try?? EDIT
Problem is solved. That was a newbie Problem, I just didn´t know how to reach the compatibility mode
(pressing the F1-F6 whlie booting the live cd, booting in this mode solved the problem).