Here are the steps you need to take to troubleshoot your printer:

1. Make sure the paper tray is full and that paper is loaded correctly.
2. Check the paper guide, and adjust if needed.
3. Check for jammed paper.
4. Check the printer settings.
5. Restart both your computer and the printer.
6. Clean the printer rollers.
7. Replace the pickup roller or the separation pad.
8. Reinstall the printer driver.