This HP ProDesk 600 G2 SFF (Small Form Factor) PC Desktop has been well maintained and is in excellent condition, as per photos.

• Model: HP ProDesk 600 G2 SFF
  
• Processor: Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
  
• RAM: 4GB, 8GB, 16GB, or 32GB
• Storage: (brand new) 128GB, 256GB, 512GB, 1TB or 2TB SSD
• Graphics: Integrated Intel HD Graphics 530
• Network: Intel Gigabit Ethernet Connection
  
• Ports: Multiple USB ports for all your devices
• Audio: Intel 100 Series/C230 Series Chipset Family HD Audio Controller
• 
  
• Operating System: Either none or a Linux distribution like below:
• --> Zorin OS: Zorin OS is an excellent choice for users who are new to Linux, particularly those switching from Windows. It has a very similar interface to Windows and can even run many Windows programs. It's optimized for everyday use and has good support for laptop hardware.
• --> Ubuntu (22.04 LTS): Ubuntu is one of the most popular Linux distributions and a great choice for beginners. Its user-friendly interface and large support community make it easy for newcomers to adapt. It comes with excellent hardware support, a vast array of software, and long-term stability with its LTS edition.
• --> Linux Mint: Linux Mint is perfect for users transitioning from Windows to Linux, with a similar interface and full multimedia support out of the box. It is easy to use, highly customizable, and provides robust performance on laptops.
• --> Elementary OS: Designed to be visually appealing and easy-to-use, Elementary OS is a great option for those who prioritize a clean and elegant interface, especially for users coming from a macOS environment. Based on Ubuntu, it's well-suited for laptop use.
• --> Manjaro: Manjaro is suitable for both newcomers and experienced users. Based on Arch Linux, it provides all of its benefits with a user-friendly interface. It's known for cutting-edge software and good hardware support, making it a robust option for laptop users.
• --> MX Linux: MX Linux is user-friendly and great for older laptops because it is not as resource-heavy as other distributions. It combines an elegant and efficient desktop with easy configuration and high stability, making it suitable for intermediate users.
• --> Debian: Debian is suitable for intermediate to advanced users. Known for its robustness and stability, Debian is an excellent choice for users who are comfortable with a slightly steeper learning curve and prioritize a stable and secure system for their laptop.
• --> Arch Linux: Arch Linux is designed for users who want a high degree of control over their laptop system. Its rolling release model keeps software up-to-date. However, it requires a good deal of manual configuration and system management, making it more suitable for advanced users.
• --> Kali Linux: Kali Linux is a specialized Linux distribution for advanced users focused on security and digital forensics. While it can be used for daily tasks, its primary function is to provide a platform for penetration testing and security auditing, making it more suitable for cybersecurity professionals.