I bet this has probably happened to you before: you're trying to print an important document, but it just won't start. You know your printer is powered up, but it acts like it's not even attached to your computer.
Your first reaction might be to try reprinting over and over again. Then you try to fiddle with the printer controls, but don't do that quite yet. It could just be that you have a traffic jam in your print queue. The print queue is the electronic list your printer software uses to line up and prioritize requests to print documents or pictures.
Sometimes, print jobs get stuck without you even noticing. Once a print job gets stuck, nothing else below it in the queue can print.
To see your print queue, double-click the printer icon in your taskbar notification tray, or go to Control Panel>>Printers and double-click on the printer icon. You can select the first print job and go to Document>>Cancel.
The worst part is that stuck jobs sometimes won't delete. They just sit there stopping your printer from doing its job.