If it is wireless, check the battery, but if its on a cord check for frayed wire and make sure the ball is in place. if the ball isn't in place put it back in correctly, if it wont spin,WD-40, in small amounts MAY help
The mouse is a major part of the computer. Try working on the computer just using your keyboard, and then you will see why the mouse is very useful.
Buy a new mouse.
unplug it and plug it back in to the computer
dead battery the wire is damged
There are many possible reasons for a non-working computer mouse. These include: 1. The mouse cable connection to the computer may be loose (for a mouse with wire) 2. Mouse cable may be cracked or broken 3. Mouse driver software may have been corrupted 4. Mouse hardware has gone bad 5. It is very unlikely but computer's PS2 or USB port where mouse is connected may also have gone bad 6. If it is a wireless mouse, it's battery may need to be charged or replaced. - Neeraj Sharma
HELP
If the computer does have a touchpad then no you can't
you hold down Ctrl and use the scroll wheel on your mouse
My browser isn't working? How can I fix it?
A common mouse problems is that the mouse does not move as accurate as the user may like. Another common problem is that the mouse stops working very fast.
clean it, reinstall the drivers, or unplug everything else from your computer that uses the same kind of connector the mouse uses
It certifies that the person working on your computer has finished a certain amount of schooling to fix your computer.