https://community.usa.canon.com/t5/Scanners/Canoscan-LiDE-400-can-t-connect-to-Mac-OS-26-2/m-p/586207#M3990 <P>My Canoscan LiDE 400 worked fine until the latest Mac OS Update. I am currently running Mac OS 26.2 Tahoe and cannot connect to the scanner. The U Scan Utility Lite software says "searching for scanners" and ultimately generates the error message:</P><P><STRONG>Cannot communicate with scanner. Possible reasons:</STRONG></P><P><STRONG>- Scanner is turned off.</STRONG></P><P><STRONG>- (If using wired LAN connection) It is disconnected from wired LAN.</STRONG></P><P><STRONG>- (If using Wi-Fi connection) Signal strength is poor due to obstructions.</STRONG></P><P><STRONG>- (If using USB connection) USB cable is disconnected.</STRONG></P><P><STRONG>Please check and try again.</STRONG></P><P>I can hear the scanner so I know it's on. It is connected via USB and I have checked and rechecked the cables. I have deleted and re-installed the Canon application - none of these things have worked. Any advice? This scanner was working great for me prior to this OS update.</P> Tue, 10 Feb 2026 02:09:26 GMT yellowlab88 2026-02-10T02:09:26Z https://community.usa.canon.com/t5/Scanners/Canoscan-LiDE-400-can-t-connect-to-Mac-OS-26-2/m-p/586207#M3990 <P>My Canoscan LiDE 400 worked fine until the latest Mac OS Update. I am currently running Mac OS 26.2 Tahoe and cannot connect to the scanner. The U Scan Utility Lite software says "searching for scanners" and ultimately generates the error message:</P><P><STRONG>Cannot communicate with scanner. Possible reasons:</STRONG></P><P><STRONG>- Scanner is turned off.</STRONG></P><P><STRONG>- (If using wired LAN connection) It is disconnected from wired LAN.</STRONG></P><P><STRONG>- (If using Wi-Fi connection) Signal strength is poor due to obstructions.</STRONG></P><P><STRONG>- (If using USB connection) USB cable is disconnected.</STRONG></P><P><STRONG>Please check and try again.</STRONG></P><P>I can hear the scanner so I know it's on. It is connected via USB and I have checked and rechecked the cables. I have deleted and re-installed the Canon application - none of these things have worked. Any advice? This scanner was working great for me prior to this OS update.</P> Tue, 10 Feb 2026 02:09:26 GMT https://community.usa.canon.com/t5/Scanners/Canoscan-LiDE-400-can-t-connect-to-Mac-OS-26-2/m-p/586207#M3990 yellowlab88 2026-02-10T02:09:26Z https://community.usa.canon.com/t5/Scanners/Canoscan-LiDE-400-can-t-connect-to-Mac-OS-26-2/m-p/592009#M4056 <P>I am having same problem. I just posted a similar problem. Look for it in Related Content?</P> Sun, 05 Apr 2026 16:11:43 GMT https://community.usa.canon.com/t5/Scanners/Canoscan-LiDE-400-can-t-connect-to-Mac-OS-26-2/m-p/592009#M4056 CatOut 2026-04-05T16:11:43Z