In a computer laboratory, a system boots normally and successfully compiles a program, but the program does not execute and no error message is displayed. The most likely cause is: 

Why RAM is the cause: Compiling a program and executing a program are two different processes. While compilation translates the source code into machine code (which the system handled successfully), execution requires loading the compiled program into the system's Random Access Memory (RAM). If the system has critically low or insufficient RAM available, the operating system may fail to allocate the memory space needed to launch the process, causing it to quietly terminate or hang without throwing a specific compilation or hardware error.

Why other options are incorrect:

A) Faulty keyboard or mouse: The system booted normally, meaning basic I/O devices are functioning or at least not preventing system operation. A faulty mouse/keyboard wouldn't silently stop a program from executing post-compilation.

C) Disconnected network cable: Unless the program specifically requires an active internet/network connection to run, a local program will still execute offline.

D) Corrupted printer driver: This would only affect print jobs, not local program execution.