Q: curser will not respond to mouse

Which iMac? What mouse? What version of OS X?

Is it actually plugged in?

Is the mouse a wireless bluetooth model that may not be sync'd to the iMac?

And is the computer a very old PowerPC model with either a G3, G4, or G5

processor? This would place its vintage appropriate to name on this thread.

• How to find the serial number on your iMac - Apple Support

If the computer is older than 2006, and does not use Intel core processors,

it would likely be iMac (PPC G5) or newer one would be iMac (Intel Core.)

• Apple iMac Specs (ALL iMac Tech Specs)

http://www.everymac.com/systems/apple/imac/index-imac.html#specs

If the computer was built and sold after 2005, it would be an intel core model.

Some of those models look near exactly like the older PowerPC G5 iMac.

• Identify the model of your iMac - Apple Support

Details woefully lacking, are essential to understand what build model of iMac

you may have, if you have one at all. Your older threads in ASC involve an

iPhone, and a MacBook Pro, for the most part; with no hints in your profile.

• Lookup Mac Specs by Serial Number, Order, Model & EMC Number, Model ID, etc:

http://www.everymac.com/ultimate-mac-lookup/

You may be able to identify the computer by model identifier number and/or

serial number, that should help you tell us what you have in front of you.

Anyway, I'm off to utilize my 'free time' elsewhere...

Good luck & happy computing!