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2. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   A large data-center-scale UPS being installed by electricians. An uninterruptible power supply (UPS) or uninterruptible power source is a type of continual power system that provides automated backup electric power to a load when the input power source or mains power fails.

3. Computer maintenance - Wikipedia

   en.wikipedia.org/wiki/Computer_maintenance

   Computer maintenance is the practice of keeping computers in a good state of repair. A computer containing accumulated dust and debris may not run properly. A computer containing accumulated dust and debris may not run properly.

4. Power supply - Wikipedia

   en.wikipedia.org/wiki/Power_supply

   A constant output voltage is required in many power supply applications, but the voltage provided by many energy sources will vary with changes in load impedance. Furthermore, when an unregulated DC power supply is the energy source, its output voltage will also vary with changing input voltage.

5. Power supply unit (computer) - Wikipedia

   en.wikipedia.org/wiki/Power_supply_unit_(computer)

   The desktop computer power supply converts the alternating current (AC) from a wall socket of mains electricity to a low-voltage direct current (DC) to operate the motherboard, processor and peripheral devices. Several direct-current voltages are required, and they must be regulated with some accuracy to provide stable operation of the computer.

6. Premium Tech Support with Assist by AOL | AOL Products

   www.aol.com/products/tech-support/assist

   Get friendly tech support online and over the phone with Assist by AOL. Virus removal, slow computers and more. Get affordable expert help today.

7. Computer repair technician - Wikipedia

   en.wikipedia.org/wiki/Computer_repair_technician

   Private sector computer repair technicians can work in corporate information technology departments, central service centers or in retail computer sales environments. Public sector computer repair technicians might work in the military, national security or law enforcement communities, health or public safety field, or an educational institution.