1. Introduction
This manual provides essential information for setting up, operating, maintaining, and troubleshooting your Acer Aspire Desktop XC-840-UB11. Please read this guide thoroughly before using your new desktop computer to ensure proper functionality and longevity.
The Acer Aspire Desktop XC-840-UB11 is a compact and efficient desktop computer designed for everyday computing tasks, business applications, and multimedia consumption. It features an Intel Celeron N4505 processor, 8GB RAM, a 512GB PCIe SSD for fast system performance, and an additional 500GB portable HDD for expanded storage. It comes pre-installed with Windows 11 and supports dual 4K monitors.
2. Package Contents
Verify that all items are present in your product package:
- Acer Aspire Desktop XC-840-UB11 Unit
- Wired USB Keyboard
- Wired USB Mouse
- Power Adapter
- Quick Start Guide (this document)
3. Product Overview
3.1. Key Features
The Acer Aspire Desktop XC-840-UB11 offers a range of features for a productive computing experience:

Image: Overview of Acer Aspire Desktop key features including processor, operating system, storage, RAM, graphics, connectivity, and design.
3.2. Front Ports
The front panel provides convenient access to frequently used ports:

Image: Detailed view of the front ports on the Acer Aspire Desktop.
- Secure Digital™ (SD) Card Reader: For reading and writing data to SD cards.
- 1 - USB 3.2 Type C Gen 1 port (up to 5 Gbps): For connecting USB-C devices and fast data transfer.
- 1 - USB 3.2 Gen 1 Port: For connecting USB-A devices with high-speed data transfer.
- 2 - Audio Ports: Typically for headphones and a microphone.
3.3. Rear Ports
The rear panel houses ports for essential peripherals and network connections:

Image: Detailed view of the rear ports on the Acer Aspire Desktop.
- 1 - VGA Port: For connecting older monitors or projectors.
- 1 - HDMI Port: For connecting modern displays, supporting up to 4K resolution.
- 4 - USB 2.0 Ports: For connecting peripherals like keyboards, mice, and printers.
- 1 - Ethernet RJ-45 Port: For wired network connection (LAN 1000 Mbps).
- 3 - Audio Ports: For line-in, line-out, and microphone connections.
3.4. Dimensions
The compact design of the Aspire Desktop allows it to fit into various workspaces.

Image: Diagram showing the physical dimensions of the Acer Aspire Desktop.
- Height: Approximately 11.61 inches (29.5 cm)
- Depth: Approximately 12.99 inches (33 cm)
- Width: Approximately 3.94 inches (10 cm)
- Weight: Approximately 15 pounds (6.8 kg)
4. Setup
Follow these steps to set up your Acer Aspire Desktop:

Image: An Acer Aspire Desktop connected to a monitor, keyboard, and mouse, ready for use.
- Unpack the Desktop: Carefully remove the desktop unit and all accessories from the packaging.
- Connect Peripherals:
- Connect the wired USB keyboard and mouse to any available USB ports on the rear panel.
- Connect your monitor(s) to the HDMI or VGA ports on the rear panel. For dual monitor support, use both HDMI and VGA, or an appropriate adapter if your monitors require different connections.
- Connect to Network (Optional): For a wired internet connection, connect an Ethernet cable from your router or modem to the RJ-45 port on the rear panel. For wireless connectivity, ensure your Wi-Fi network is available during initial setup.
- Connect Power: Plug the power adapter into the desktop's power input, then plug the power cord into a wall outlet.
- Power On: Press the power button located on the front of the desktop. The system will boot up.
- Initial Windows 11 Setup: Follow the on-screen instructions to complete the Windows 11 setup process, including selecting your region, connecting to Wi-Fi (if not using wired), creating a user account, and setting privacy preferences.
5. Operating Instructions
5.1. Using Windows 11
Your desktop comes with Windows 11 pre-installed. Familiarize yourself with the new interface, Start Menu, and taskbar. You can customize settings, download applications from the Microsoft Store, and browse the web using Microsoft Edge or your preferred browser.
5.2. Storage Management
The system includes a 512GB PCIe SSD for the operating system and applications, ensuring fast boot times and responsive performance. The 500GB portable HDD provides additional space for documents, media, and other files. Ensure important data is regularly backed up.
5.3. Connecting Dual 4K Monitors
The desktop supports dual 4K monitors. Connect your primary monitor to the HDMI port and your secondary monitor to the VGA port (or another HDMI port if available via adapter). Once connected, right-click on the desktop, select 'Display settings', and configure your display preferences (extend, duplicate, etc.).
5.4. SD Card Reader Usage
Insert your SD card into the front-panel SD card reader. The system will automatically detect the card, and you can access its contents via File Explorer. Always safely eject the SD card before removing it.
5.5. Ultra-Quiet Operation
The Acer Aspire Desktop is designed with an ultra-quiet cooling system, minimizing operational noise for a more comfortable work environment.
6. Maintenance
Regular maintenance helps ensure optimal performance and extends the life of your desktop:
- Cleaning: Use a soft, dry cloth to clean the exterior. For dust accumulation in vents, use compressed air. Do not use liquid cleaners directly on the device.
- Software Updates: Regularly check for and install Windows updates and driver updates to ensure system stability and security.
- Data Backup: Periodically back up your important files to an external drive or cloud storage to prevent data loss.
- System Optimization: Use Windows built-in tools like Disk Cleanup and Disk Defragmenter (for HDD) to maintain system performance.
7. Troubleshooting
If you encounter issues with your desktop, refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| No Power | Ensure the power cable is securely connected to both the desktop and the wall outlet. Check if the power outlet is functional. |
| No Display on Monitor | Verify monitor cables are securely connected to both the desktop and the monitor. Ensure the monitor is powered on and set to the correct input source. Try connecting to a different port or monitor if available. |
| Slow Performance | Close unnecessary applications. Check for background processes consuming high resources. Ensure Windows and drivers are up to date. Run a virus scan. |
| Keyboard/Mouse Not Working | Ensure USB cables are firmly connected. Try different USB ports. Restart the computer. |
| No Internet Connection | For wired: Check Ethernet cable and router/modem status. For Wi-Fi: Ensure Wi-Fi is enabled in Windows settings and you are connected to the correct network. Restart your router/modem. |
If these solutions do not resolve the issue, please contact Acer customer support for further assistance.
8. Specifications
Detailed technical specifications for the Acer Aspire Desktop XC-840-UB11:
| Component | Specification |
|---|---|
| Processor | Intel Celeron N4505 (Dual-Core, up to 2.9 GHz) |
| RAM | 8GB DDR4 (Expandable up to 64GB) |
| Storage | 512GB PCIe SSD + 500GB Portable HDD |
| Graphics | Intel UHD Graphics (Integrated, supports 4K HDR Playback) |
| Operating System | Windows 11 Home |
| Wireless Connectivity | Wi-Fi 6 (802.11ax), Bluetooth 5.2 |
| Wired Connectivity | Gigabit Ethernet (RJ-45) |
| Front Ports | 1x USB 3.2 Type-C Gen 1, 1x USB 3.2 Gen 1, SD Card Reader, 2x Audio Jacks |
| Rear Ports | 1x HDMI, 1x VGA, 4x USB 2.0, 1x RJ-45, 3x Audio Jacks |
| Dimensions (LxWxH) | 19.5 x 6.6 x 14.5 inches (approx. 49.5 x 16.8 x 36.8 cm) |
| Weight | 15 pounds (approx. 6.8 kg) |
| Power Supply | 65W |
9. Warranty and Support
Your Acer Aspire Desktop XC-840-UB11 is covered by a standard manufacturer's warranty. Please refer to the warranty card included in your package for specific terms and conditions, including warranty duration and coverage details.
For technical support, driver downloads, or service inquiries, please visit the official Acer support website or contact their customer service. Have your product model number (XC-840-UB11) and serial number ready when contacting support.
Online Support: www.acer.com/support
10. Additional Resources
Here are some helpful videos related to desktop computers and their setup:
Video: General overview of desktop computer components and basic setup. (Duration: 1:23)
Video: Guide to connecting peripherals and initial boot-up for a desktop PC. (Duration: 2:54)
Video: Tips for optimizing Windows 11 performance and managing storage. (Duration: 1:53)





