What represents a common issue caused by dirty feed rollers in laser printers?

The presence of dirty feed rollers in laser printers can lead to vertical or horizontal lines on printed pages. These lines occur because dirty rollers can fail to grip the paper properly, causing it to feed inconsistently through the printer. As the paper moves, it may shift or skew, resulting in lines that appear on the printed output. This problem typically manifests as streaks or smudges that are parallel to the direction of the paper feed due to the inconsistent movement.

The other options mention issues typically associated with different problems. Garbled text usually indicates a communication error between the computer and the printer or issues with the printer's firmware. Ghosting refers to a faint duplicate image on the page and is often caused by problems with the developing unit or transfer roller, not the feed rollers. Incorrect colors often arise from toner issues, such as low toner levels, incorrect toner types, or problems in the print engine, rather than from concerns related to the feed rollers.