Why might a user choose an HDMI cable when building a new computer system?

Choosing an HDMI cable when building a new computer system primarily serves the purpose of connecting a digital monitor. HDMI, which stands for High-Definition Multimedia Interface, is designed to transfer high-quality audio and video signals digitally. This makes it an ideal choice for connecting to modern monitors that support high-definition resolutions.

Using an HDMI cable ensures that the user can take advantage of clear and vibrant video output, along with multi-channel audio capabilities, all through a single cable. This simplifies the connection process and minimizes cable clutter, particularly beneficial in a new system where organization may be a priority.

The other options do not align with the primary function of an HDMI cable. Power supply connections involve different types of cables and connectors, while internal data transfers typically use cables such as SATA or PCIe. Finally, connecting external storage devices often requires USB or eSATA interfaces rather than HDMI.