Once a computer fails, simple things users can try and do to make their life easier include noting down the steps they are taking while troubleshooting so they can keep track of things in case something else fails further down the line.
In addition, it is important to write down what sort of error messages the system is showing.
One important thing to try before hand if no apparent error is presented by the machine, is the cables. Check if they are all in the right place and connected. Also check the power supply to ensure it is turned on.
Standard Definition Exists?
Analyse and solve serious problems for a company or other organization. Trace and correct faults in a mechanical or electronic system.