there could be two reason
1) Driver issue
2) hardware fault
Because some people prefer using the keyboard instead of the mouse.
the advantage and use of computer mouse is to click icons. by using mouse is faster in terms of pointing in to an object on your computer. unlike by using keyboard, you need some keyboard shortcuts in order to execute or click an object.
mouse ,keyboard, joysticks are some examples for input devices
The Apple wireless keyboard and mouse are not supplied with a standard Mac. They can be purchased separately. With the standard iMac wired keyboard and mouse the mouse can plug into the USB socket on the keyboard and they can both be tucked away under the screen to give you some desk space.
The keyboard or a representation of one is the commonest. My opinion.
It more that there are some that will work on the PS3
You don't usually have to turn off the "mouse and keyboard" at all. On some models of the mac, the power button was on the keyboard, but pressing it starts the computer, it doesn't turn off the keyboard. If you have a wireless keyboard/mouse, then if you don't turn them off they're still running on battery power. The batteries won't last as long if you don't shut them off, but you don't HAVE to do it.
mouse, monitor and keyboard
Similarities is that they both have a keyboard for typing purposes.
An input device is anything that a person can use to add information to a computer so it can work. A CD, web camera, mouse, keyboard, digital camera, drawing tablet, microphone, scanner, disk drive, joystick, ATM, and bar code scanners can all be used as input devices.
keyboard,mouse,joypad,graphic table and Microphone.
its pretty hard to draw mickey mouse but, there is some sites that did some mickey mouse drawings and other stuff