- Fix performance problems
- Eliminate errors
- Have a stable running environment
As hard as you try to avoid them, problems do arise with errors and performance problems. Most of the time it is a simple software fix, driver fix, and or hardware fix.
The hard part is to determine and find the problem. Sometimes it is a visible easy solution. For all the other times you need an experienced technician to find and fix the problem.
Most diagnostic time is less then an hour.