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Basic principles of computer repair
In order to troubleshoot a computer, it is necessary to follow principles of "easy, then difficult", "first outside, then inside" and "first weak, then difficult" to make maintenance more efficient.
One, easy at first, then hard
Easy before hard means starting with simplest things when dealing with computer glitches, and then evaluating and fixing them after careful observation, which encourages focus on evaluating and locating glitches. If computer malfunctions, following checks should be performed.
1. Check host environment (fault, power supply, connection, temperature, etc.).
2. Check internal environment of host (dust, connection, power supply, temperature, etc.).
3. Monitor software and hardware configuration of computer (what hardware is installed).
4. Resource usage (what operating system is being used, what software is installed).
5. Hardware device driver version, etc.
Secondly, first outside, then inside
"Outside first, then inside" means that maintenance should start at computer's peripherals, such as monitors, printers, and so on. After making sure that external devices are working, check host's internal devices.
Third, soft first, then hard
Under normal circumstances, computer software crashes occur relatively easily, so you should follow "software first, hard later" approach when troubleshooting. You must first eliminate possibility of software failures by testing software or software tools, and then check for hardware failures.