There are a few possible reasons why a scanner may be displaying an error message on startup.
1) The scanner may be malfunctioning or broken due to physical damage or wear and tear. This could be due to electrical damage, overheating, incorrect usage or other mechanical issues.
2) The driver or software associated with the device may be outdated or incompatible with the hardware. This could lead to conflicts between the system and the scanner, leading to errors.
3) The environment of the scanner may be unsuitable for proper operation. This could be due to dust and dirt particles clogging the sensitive components of the scanner, or to low lighting that prevents the optical lens from capturing sufficient image data.
4) The connection between the computer and the scanner may be faulty, which could cause communication problems between the two.
These are some of the most common reasons why a scanner may be displaying an error message on startup. To solve the issue, it is important to determine the source of the problem and repair or replace any defective components if necessary.