When I click on a print job it won't print. Tells me their is a jam.

Your question does not provide all the information necessary to absolutely resolve the issue. By now I suspect you've already resolved the issue or given up. Perhaps someone can use this info.

Need to know: Operating System (Windows 95/98/Vista/XP/7/8), Application (Word, Paint, Firefox, etc), type of job (jpg, pdf, text, etc.)

There is no short answer possible; but, I may be able to help with a generic answer. I can't help on Apple but I suspect it's the same as Windows, (and Unix, Linux, OS2, etc.).

Provided the Printer works proper on normal 8 ½ x 11 stock (print media) then it is not a printer or Queue issue unless it is just confused. As a printer technician I have seen this resolved by rebooting the machine(s) and trying to print again. If that doesn't resolve the issue you need to know:

The application you send the print job from tells the Queue what stock (letter, legal, card, envelope etc) to expect. The Queue, a component of all versions of Windows, is created when the printer is initially installed on the computer. The Queue holds print jobs and then sends them on to the printer when the printer tells the Queue it is ready. Some applications are more robust allowing more options than others. However, printing from inside a browser is frequently sketchy. If you're printing from an application that is different from the one that created it you may face an issue of the printer not getting the correct stock information.

Very Important: First before you attempt to send the print job check the settings in the app to insure your job has the right paper stock selected. Then, as you prepare to send the job from the app to the Queue before you hit the final "Print" button, check the "Paper Source/Size/Media" boxes in the "Printer Properties" to make sure your sending the right stock information. If that doesn't fix it; try to save your project in a format readable by another application and try to print it from the other app.

Note: 1. Print jobs are served to the printer by the Queue one at a time on a FIFO (First In First Out) basis. Sometimes print jobs get hung up in the Queue. A hung print job will block all subsequent jobs until the hung job is cleared. When a print job is sent and nothing happens (no printer activity or error messages on the screen.) look in the System Tray for a printer icon. Open it up and see if there are any jobs hung. If so cancel them and start afresh. This may require a reboot.
2. Print Queues can (rarely) become corrupt and must be deleted and rebuilt.

There are still variables too numerous to mention.
You can get HP Support at
HP Photosmart C7280 All in One Printer support

Whew! I've never tried to help resolve this issue in a post. Good Luck!

You'll have to open up the printer and remove any paper pieces that are blocking paper delivery. There's usually a panel on the back of the printer that removes easily, maybe with a twist of a lever, and you might look in the front too. I couldn't find a troubleshooter manual online, but you should have one in your documentation; It should tell you where to look for jams.

1. Background
   • HP provides details of the problem on its website. The problem usually occur on PC laptops or when printing across a network. HP offers several fixes for the problem.
     
   Software
   • First, check your Windows print queue and ensure the printer is not set as "Paused" or "Working Offline." This can often clear the problem and resume your printing.
     
   • 
     
   Resolution
   • The problem can also be caused by printer driver issues. Try uninstalling and reinstalling the printer driver. Connecting your printer directly to your computer using a parallel cable may solve the problem, but this may not be practical in all cases as many modern laptop computers do not have a parallel port.
     

Instructions

1. • 1 "Power Cycle" Your printer. Shut down the printer, unplug the power cord from the socket, give it 5 minutes, plug it in again and turn it back on. Try to print.
     
   • 2 If the printer still won't process a job, shut down and restart your computer.
     
   • 3 Check your printer cable connections to the computer.
     
   • 4 Check the printer for any paper jams, check the trays, and also pull out the toner cartridge and/or remove any paper jam, if you find one. Put the cartridge back in. Then try to print.
     
   • 5 If after completing the steps above, the printer is still not working, click "Start," then "Settings," click "Printers," and the printer folder will open. Make sure your HP LaserJet 5 is selected as the default printer.
     
   • 6 Double-click your printer, and delete everything from the print queue, canceling all the print jobs. Close out the queue.
     
   • 7 Right-click on your printer icon and make sure it's not offline. If it is, then click "use this printer online."
     
   • 8 Right-click your printer, and click properties. Make sure the right port is selected for your LaserJet 5 Printer. If you are using a parallel cable, you are most likely using an LPT port; if USB, then look for a USB connection in the list. If the port connection is correct, try to print again.
     
   • 9 It's still not printing? Click "Start," then "Control Panel." Double-click "Programs and Features" or "add or remove programs," uninstall your Laserjet printer software, and restart your computer.
     
   • 10 Insert your Laserjet software and driver disk. Proceed to reinstall your printer software and drivers. Then test the printer again. If it is still not working, you probably will have to seek professional assistance.
     

hi, check paper present sensor flag moment,clean sensor for any dust or obstruction will resolve the issue.

This sometimes happens if a print job freezes before, or during the print. I would suggest two things. Open up your print que, which you should be able to access from the bottom right hand side of your screen in your task bar. Right click, and open print que. If there is a print job in the que that says printing, try to right click on the job and cancel it. If this does not work and you have not done so already, restart your computer and your printer! Go back into the que if you have to and if the job is still there, right click and cancel job again. Then, retry printing a something different from your printer. This should solve your problem.

Make sure there are no print jobs stuck in the queue. If you're using Windows, go to the Control Panel > Printers > double-click on the Lexmark print object. Delete all print jobs pending. If you can't clear all print jobs, follow the steps below:

1. Browse to Start -> Run... and type in "NET STOP SPOOLER" (this will stop the print spooler service)

2. Browse to your windows\system32\spool\PRINTERS\ folder. You should see files there ending in .SPL and .SHD created around the time you tried to print - delete these files.

3. Browse to Start -> Run... and type in "NET START SPOOLER" (this will restart the print spooler service)

Double click the printer icon in the lower-right corner of your taskbar to examine your print job queue and browse to View -> Refresh.

Reboot your computer. Then, try to scan again.

You need to delete all jobs in the print queue, see instructions below:

If you've ever had a print job hang, you're probably familiar with the Windows Print Spooler window. You get to this window simply by selecting the relevant printer from the Control Panel's Printers and Faxes applet (simply Printers in Vista). In the somewhat unusual event of a printer queue jam, you can go to the Print Spooler and simply delete the job. Sometimes, though, the system won't let you cut off print jobs that way: It marks the job "Deleting..." but never quite gets there, and you end up rebooting. But there's an easier way.
Open a command prompt (go to Start ' Run, then type cmd) and type the following, pressing enter after each line:
net stop spooler
del c:\windows\system32\spool\printers\*.shd
del c:\windows\system32\spool\printers\*.spl
net start spooler
In Vista you'll need to open an elevated command prompt by right-clicking on cmd.exe and selecting Run as Administrator. For those of you who remember batch files, use Notepad to save the four commands above as a batch file. I've named mine Killqueue.bat.

you might have a print job in the spooler, right click on your printer icon, select open and right click on any jobs, and select delete.

Sounds like you may have one or more print jobs stuck in the queue.

First, turn the All-in-one printer off. Disconnect it from your computer and turn it back on. Verify that the printer will print by performing a self-test.

With the printer still disconnected, go to this URL and select the link for your operating system. This will give you the procedure for clearing the stuck jobs from the print queue.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=npu03238&lc=en&dlc=en&cc=uk&lang=en&product=1103491#N798

Turn the printer back on and verify that you can print from your computer.

Hope this helps!

1) Remove your printer from the USB port.
2) Uninstall the printer from Add/Remove Programs in the control panel.
3) Reboot
4) Download and install the latest drivers from HP's website.
You should be good to go.