Whenever a print job is sent to my dell 3100cn laser printer, ?Load tray 1? appears in the small window of the printer. I loaded the tray several times but it doesn?t work. Please guide me through the procedure of loading the tray with regular paper sheets. Previously the same problem was solved after few tries, but its not working any more.

Dell 3100cn Color Laser Printer Error 024-965 - Load Tray 1

Cause:
The "Paper Tray Inserted" sensor buttons are not being depressed by the Paper Tray so the Printer thinks no Tray is inserted even if the Tray is properly inserted.

If you pull out the paper tray and look at the Paper Tray opening, you will see three white vertical sensor buttons along the left-hand side at the mouth of the aperture where the paper tray slides in. These three white vertically aligned push button sensors tell the printer that the Paper Tray is inserted when the paper Tray is
properly pushed all the way in and aligned. It also signals to the printer by noting which button is depressed whether the tray is a Letter Size or Legal Size tray that has been inserted. These buttons which are fully visible as soon as the tray is slid out can move out of place and even fall into the wall of the Tray slot preventing the buttons from sensing the tray.

Solution:
Click it back into place. There should be no play and the buttons themselves should be the only thing that move and then only in an in and out manner. They should move out toward you when the Tray is removed and be pushed in when the tray in slid into the paper tray feedering slot. A pair of needle-nose pliers may be necessary to draw the button module out of the tray slot wall if it has fallen in. Once it is STIFFLY repositioned and the Paper Tray reinserted, reset the printer by opening and quickly reshutting the printer cartridge compartment. This action will recalibrate the printer, shut off the amber error light and resume the current printing job if one was in progress.

Good luck!

You sent a paper size different of the requested by the printer. Just load the requested size or delete the spool.
Some PDF downloaded from internet has A4 or 8,5x11", maybe is requesting one of this sizes.

If you can not delete this message, delete the spool using the printer manual in the control panel of the printer.