Final answer:
A practical alternative to BIOS POST beep codes for computer troubleshooting is the use of diagnostic LED indicators on motherboards, Pre-boot eXecution Environment (PXE), UEFI detailed POST information, and proprietary diagnostic software tools.
Step-by-step explanation:
An alternative to using BIOS Power-On Self-Test (POST) beep codes and video messages for troubleshooting a computer's boot process is the use of diagnostic LED indicators that are often present on motherboards. These LED lights can indicate which component (such as the CPU, memory, or graphics card) is causing the computer to fail POST, without the need for beep codes or a functional display.
Additionally, some newer computer systems rely on a Pre-boot eXecution Environment (PXE) to perform diagnostics and to boot over a network, which can be another alternative.
Certain PCs with Unified Extensible Firmware Interface (UEFI) may also provide detailed POST information on-screen, which is a more modern and user-friendly approach compared to traditional beep codes or diagnostic LEDs. Lastly, proprietary software diagnostic tools provided by the computer manufacturer can be used to troubleshoot hardware issues.