What is the most likely solution for a printer that only prints the top half of each page?

The most likely solution for a printer that is only printing the top half of each page is to install additional memory in the printer. Printers rely on sufficient memory to process and buffer the data being sent to them. When the printer does not have enough memory, it can struggle to handle large print jobs or complex documents, which may result in incomplete prints or pages that only partially print, such as only producing the top half of each page.

The other options, while they may address different issues, are less likely to resolve this particular problem. Checking printer connectivity is essential for any printer issues, but it wouldn’t directly affect the printing content if there's a connection established, as is the case here. Replacing the toner cartridge is necessary when prints come out faint or with poor quality, but that typically doesn’t lead to half-printed outputs. Reinstalling the printer driver can resolve issues with formatting or communication errors, but is generally not the solution for memory-related problems that cause incomplete prints. Therefore, adding memory addresses the underlying issue of data processing capacity directly related to the problem described.