Am I sounding redundant yet? I hope not, because this is probably the most important thing to having your stuff work...
Now with the new USB Mice and Keyboards this isn’t as much a problem, but with the non-USB the keyboard and the mouse plugs are actually the same kind of plug, and neither will work if they’re the wrong way around. Don’t worry though because beside each will be a little icon depicting which one it corresponds to. They might also be color coded.
For whatever reason a connection might be bad. It doesn’t hurt to turn the computer off, reseat (unplug and re-plug) everything and then turn it back on. This will allow the computer to reset and (hopefully) the connections to fix.
Some of you may have wireless Mice and Keyboards, so similar to “Make sure they’re plugged in!” is “Make sure it has charged batteries!” It’s easy to forget a battery needs to be changed so with wireless equipment that should be the first thing you check.
On wireless devices, somewhere on them will be a “Connect” button, which you need to press in order for it to connect to the computer. It may not connect on the first try, so give it a few shots if it doesn’t connect on the very first attempt.
Make sure it isn’t a problem with your computer itself by trying a different mouse/keyboard if you have one handy. It would be irritating buying a new mouse only to find out that the problem isn’t your mouse, but your computer! Then you have two mice, but still nothing works! No one wants that, so it pays to make sure.
That’s pretty much it for Mouse and Keyboard troubleshooting. Luckily the simple ones are cheap to replace so repairing isn’t really a necessary step for those. See you next time!