Pandemonium

Ok will do thanks

When I was starting up my computer today, I was holding down the dpi button and clicking to change the colour of the mouse, and all of a sudden the mouse colour turned off, and the cursor stopped responding. I tried moving the mouse to a different computer, and the cursor still won't respond, even though the light underneath the mouse is still on. Did I turn off the mouse cursor response somehow? Is there a way to turn it back on??