Error numbers above 10000 are passed through from Windows (they are not specific HTBasic error codes). It is likely a permissions error caused by change in ownership of a file, folder, or in this case printer. You said this happened after IT scan. Not sure what was involved in this, but probably related to your login permissions and being assigned as new account owner after departure of your retired guy. So it’s an IT issue. Line 1280 OUTPUT 26 USING “K,#”;CHR$(27)&”%0B” ! Enter HPGL Mode, is simply trying to send an escape sequence to the printer assigned to ISC (Interface Select Code) 26 to set it to HPGL mode as the comment indicates.