diagnosing and resolving issues with a computer's hardware, software, and performance. Technicians address problems ranging from virus removal and data recovery to replacing physical components. Services are often provided through on-site visits, off-site repair shops, or remote support. 

• Operating system (OS) repairs and installation: Repairing corrupted system files, fixing OS errors like the "Blue Screen of Death" (BSOD), and performing fresh installations or upgrades of the operating system.
• Virus and malware removal: Removing malicious software, spyware, and adware that cause slow performance, frequent crashes, and pop-up ads.
• System optimization and tune-ups: Improving a computer's performance by clearing temporary files, managing startup programs, updating software, and resolving software conflicts.
• Software troubleshooting: Diagnosing and fixing issues with specific applications that are crashing or malfunctioning. 

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• Component repair and replacement: Fixing or replacing faulty physical parts, such as the motherboard, hard drive, RAM, graphics card, or power supply.
• Laptop repairs: Addressing specialized issues like cracked or broken laptop screens, non-responsive keyboards, and failing batteries.
• Cooling system repair: Cleaning dust from fans and heatsinks, or replacing faulty cooling components to prevent overheating.
• Networking: Setting up, maintaining, and troubleshooting wired and wireless computer networks. 

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• Data recovery: Retrieving lost, corrupted, or accidentally deleted files from damaged storage devices like hard drives and flash drives.
• Data backup: Setting up robust backup strategies to prevent future data loss for both personal and business use. 

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• Preventive maintenance: Regular check-ups, cleaning, and software updates to ensure optimal performance and prolong the life of the computer.
• Upgrades and enhancements: Increasing a computer's memory (RAM), replacing a hard disk drive (HDD) with a solid-state drive (SSD), or upgrading graphics capabilities to improve performance.
• Remote technical support: Offering remote assistance and troubleshooting for issues that can be resolved without an in-person visit.
• Custom builds: Assembling custom computers for specific needs, such as high-performance gaming or business use.