Cooler Master MB500-KGNN-S00
Cooler Master MasterBox 500 PC Case User Manual
Model: MB500-KGNN-S00
Brand: Cooler Master
Introduction
This user manual provides comprehensive instructions for the setup, operation, and maintenance of your Cooler Master MasterBox 500 PC Case. Designed for enthusiasts and builders, the MasterBox 500 offers versatile component support, efficient cooling options, and customizable ARGB lighting. Please read this manual thoroughly before beginning your build to ensure proper installation and optimal performance.
Setup and Installation
1. Unpacking and Inspection
Carefully remove the PC case from its packaging. Inspect the case for any signs of damage that may have occurred during transit. Retain the original packaging for future transport or storage.
2. Included Components
Verify that all expected components are present. The MasterBox 500 typically includes:
- MasterBox 500 PC Case
- Accessory box (screws, zip ties, standoffs, etc.)
- Pre-installed 120mm ARGB fan (front)
- Pre-installed 120mm fan (rear)
- User Manual (this document)
3. Panel Removal
Before installing components, the side and top panels must be removed.
- Tempered Glass Side Panel: This panel is secured with pins and an optional screw. To remove, locate the screw (if present) at the rear of the panel and loosen it. Gently pull the panel away from the case using the designated finger holds.
- Steel Side Panel: This panel is secured with thumbscrews at the rear. Loosen the thumbscrews and slide the panel backward to remove.
- Top Panel: The top panel is entirely removable to facilitate access for cooling solutions. Gently pull upwards from the front or rear edges to detach it.

Image: The MasterBox 500 with its side panel removed, providing a clear view of the spacious interior and mounting points for components. This view highlights the ease of access for installation.
4. Motherboard Installation
The MasterBox 500 supports mini-ITX, micro-ATX, ATX, and E-ATX (up to 12" x 10.7") motherboards. Install the necessary standoffs for your motherboard form factor. Carefully align your motherboard with the standoffs and I/O shield, then secure it with screws.
5. Component Installation
- CPU Cooler: Install your CPU cooler (up to 165mm height) according to its manufacturer's instructions.
- Graphics Card (GPU): Install your graphics card (up to 410mm length) into the appropriate PCIe slot and secure it.
- Power Supply Unit (PSU): Install the PSU (up to 180mm length) into the bottom mount bay.
- Storage Drives: Install 2.5" or 3.5" storage drives into the designated bays.
6. Cable Management
Utilize the cable routing cutouts and tie-down points behind the motherboard tray to manage cables effectively. This improves airflow and aesthetics.

Image: The exterior of the MasterBox 500 PC case, showcasing its sleek design, FineMesh front panel, and the tempered glass side panel. This image represents the completed build appearance.
Operating Instructions
1. Power On/Off
Connect your power supply to a wall outlet. Press the power button located on the top I/O panel of the case to power on your system. To power off, use the operating system's shutdown function or press and hold the power button.
2. ARGB Lighting Control
The MasterBox 500 features circuit-inspired ARGB accents on the front panel and includes a pre-installed ARGB fan. These can be customized via a dedicated button on the I/O panel or through compatible motherboard software if connected to an ARGB header.
- I/O Panel Button: Press the dedicated ARGB button to cycle through various lighting modes and colors.
- Motherboard Software: For advanced customization, connect the case's ARGB cables to your motherboard's 3-pin ARGB header and use the motherboard manufacturer's RGB software.

Image: The MasterBox 500 PC case illuminated with its ARGB lighting, highlighting the customizable light effects on the front panel and the pre-installed fan. This demonstrates the visual appeal of the case when powered on.
3. Airflow Configuration
The MasterBox 500 is designed for optimal airflow. The FineMesh front panel allows for maximum air intake. Ensure proper fan placement for efficient cooling. The case supports up to 7x 120mm fans or 4x 140mm + 1x 120mm fans, and up to 2x 360mm liquid cooling radiators.
Maintenance
1. Dust Filtration
Regularly clean the dust filters to maintain optimal airflow and prevent dust buildup inside the case. The FineMesh front panel acts as a dust filter and can be cleaned by gently wiping or using compressed air.
2. General Cleaning
Use a soft, damp cloth to clean the exterior surfaces of the case. Avoid abrasive cleaners or solvents. For the interior, use compressed air to remove dust from components and internal surfaces.
Troubleshooting
If you encounter issues with your MasterBox 500 PC case, consider the following common solutions:
- Fans Not Spinning / ARGB Not Lighting Up:
- Check all fan and ARGB cable connections to the motherboard or controller.
- Ensure the power supply is providing adequate power.
- Verify that the ARGB button on the I/O panel is functioning or that motherboard software settings are correct.
- Insufficient Cooling:
- Ensure all fans are installed in the correct orientation for optimal airflow (intake/exhaust).
- Clean dust filters and internal components to improve air circulation.
- Verify that CPU cooler and GPU fans are spinning correctly.
- Panel Re-installation Issues:
- Ensure panels are correctly aligned with their respective mounting points before applying pressure.
- For the tempered glass panel, ensure the pins align with the chassis holes.
For further assistance, please refer to the Cooler Master support website or contact their customer service.
Specifications
| Feature | Detail |
|---|---|
| Model Name | MasterBox 500 |
| Model Number | MB500-KGNN-S00 |
| Case Type | Mid Tower |
| Dimensions (LxWxH) | 19.88 x 8.23 x 19.65 inches |
| Weight | 16.94 pounds |
| Motherboard Compatibility | mini-ITX, micro-ATX, ATX, Extended ATX (up to 12" x 10.7") |
| Material | Steel, Plastic, Tempered Glass |
| Pre-installed Fans | 1x 120mm ARGB (Front), 1x 120mm (Rear) |
| Fan Support | Front: 3x 120mm / 2x 140mm; Top: 2x 120mm / 2x 140mm; Rear: 1x 120mm |
| Radiator Support | Front: 120mm, 140mm, 240mm, 280mm, 360mm; Top: 120mm, 240mm, 360mm; Rear: 120mm |
| Max CPU Cooler Height | 165mm |
| Max GPU Length | 410mm |
| Max PSU Length | 180mm |
| Drive Bays | 2x 3.5" / 2.5" Combo, 2x 2.5" SSD |
| I/O Panel | 2x USB 3.2 Gen 1 Type-A, 1x 3.5mm Headset Jack, 1x ARGB Control Button |
Warranty and Support
Cooler Master products are backed by a limited warranty. Specific warranty terms and conditions may vary by region and product. Please visit the official Cooler Master website for detailed warranty information and to register your product.
For technical support, troubleshooting guides, FAQs, and driver downloads, please visit the Cooler Master support portal:
You may also contact Cooler Master customer service directly for personalized assistance.
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