To change the colours and power of the fans on this PC, you can use the software supplied by the motherboard manufacturer or third-party hardware management software, often pre-installed or downloadable from the manufacturer's website. Typically, gaming PCs like this have a fan and RGB (colour) lighting control utility built into the motherboard or tower.

As the PC is equipped with a GeForce RTX 5080 graphics card, for colours linked to the graphics card (RGB lighting), you can also use NVIDIA software or compatible RGB software (for example, MSI Mystic Light, ASUS Aura Sync, or Corsair iCUE, depending on the brand of motherboard).

For precise fan management, you need to check the motherboard software (often accessible at start-up or via Windows), which allows you to adjust fan speed according to temperature.

If you don't find any specific software pre-installed, I advise you to consult the motherboard manual or Captiva support to find out the exact name of the software to use. The Windows 11 Home operating system is pre-installed, so you can also look in the settings or via the device manager to identify the utilities available.