I know this has happened to you before: You're trying to print an important document, but it just won't print. You know your printer is working, but it acts like it's not even attached to your computer.
Your first reaction might be 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.
Sometimes print jobs get stuck without you noticing. Once a print job gets stuck, nothing else 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.