my hp laserjet m234dwe won't pick up any paper, just makes a grinding noise. help?

Diagnosis

The grinding noise combined with a failure to pick up paper on the HP LaserJet Pro MFP M234dwe typically indicates a mechanical struggle where the pickup roller is spinning without traction, or a foreign object is obstructing the paper path. When the rubber tire on the pickup roller becomes glazed with paper dust or contaminated with oils, it loses its coefficient of friction. The motor continues to drive the gear assembly, but because the roller cannot grip the top sheet of the stack, the gears may slip or vibrate, creating that characteristic grinding sound. Alternatively, this sound can be caused by a "paper jam" that isn't fully cleared—specifically a small scrap of torn paper lodged in the pickup assembly or a shifted paper guide that is putting undue pressure on the drive gear. To confirm this is a roller issue, try loading a small stack of heavier 24lb bond paper; if the printer manages to grab the thicker paper but fails with standard 20lb office paper, the rollers are definitely worn or dirty. If the noise is a sharp, metallic grinding, it is more likely a physical obstruction or a stripped gear in the feed mechanism.

How to Fix It

To resolve the lack of traction and eliminate the grinding noise, you must perform a deep clean of the pickup assembly. Follow these precise steps:

1. Power down the device completely and disconnect the power cable from the rear AC inlet to prevent electrical shorts during cleaning.
2. Remove the input tray and clear out all remaining paper. Check the tray area for any fallen staples, paper clips, or debris that may be jamming the roller assembly.
3. Carefully tilt the printer onto its side or back to gain access to the underside of the paper feed area.
4. Locate the blue release latch on the underside of the chassis. Firmly press and hold the latch while sliding the access panel away from the body of the machine.
5. Inspect the gray rubber pickup roller. If you see a shiny, smooth surface on the rubber, it is glazed and needs cleaning.
6. Dampen a lint-free microfiber cloth with a small amount of distilled water or 70% isopropyl alcohol. Do not saturate the cloth, as excess liquid can seep into the drive gears.
7. Wipe the circumference of the rubber roller using moderate pressure, rotating the roller manually with your finger to ensure the entire surface is cleaned.
8. Use a dry section of the cloth to remove any remaining residue.
9. Allow the rollers to air-dry for at least 10 minutes. Reinstall the access panel, snap the blue latch back into place, and reconnect the power.

If That Didn't Work

• Adjust Paper Guides: Ensure the paper width and length guides in the input tray are snug against the paper stack but not overly tight. If the guides are too tight, the paper bows, preventing the roller from making flat contact, which causes the motor to strain and grind.
• Inspect the Separation Pad: Look at the small rubber pad located directly opposite the pickup roller. If this pad is worn flat or indented, it will allow multiple sheets to enter or prevent the first sheet from being pushed forward. Clean this pad with a damp cloth or replace it if the rubber is cracked.
• Check for "Ghost" Jams: Open the rear access door and the toner cartridge area. Use a flashlight to look for tiny shreds of paper caught in the registration rollers. Even a piece of paper the size of a fingernail can trigger a sensor or obstruct the gear movement, causing the drive motor to grind.
• Reset the Feed Mechanism: Perform a hard power reset by unplugging the printer while it is still turned on, waiting 60 seconds, and then plugging it back in. This resets the stepper motor positions and can sometimes clear a mechanical "hang" in the pickup assembly.

Heads Up

• Avoid using heavy lubricants or WD-40 on the rollers; these chemicals destroy the rubber compounds and will make the printer permanently unable to grip paper.
• Only use high-quality, dry paper. Damp paper or paper stored in humid environments causes the rollers to glaze over much faster.
• If you frequently print on labels or heavy cardstock, clean the rollers every 1,000 pages to prevent adhesive residue from building up on the pickup tire.
• Always ensure the paper is loaded squarely in the tray; skewed paper puts lateral pressure on the pickup gear, leading to premature wear of the plastic teeth.