Hello, you need to offer a little more info as it is difficult to help when people dont know what version of mint you are using, the desktop environment (cinnamon/mate etc) or any of your computer's spec's, there are different ways to solve the same problem in differerent desktops, just like windows, there isn't a universal fix it so if you can post some more info somebody will be able to help . . . .. . . .
Lenovo ThinkPad T61 LM16-64 bit Intel T7500/2.2GHz/Cinammon 1.8 Intel GM965. Toshiba Satellite M70: LM16-32bit. Desktop:LM13 Maya 64 bit, on new Intel 3.2ghz proc/asus MB/8gb RAM