There are two methods to request service for a computer
If you are in a district building, you can use this web link for repairWeb link for Technology Help Desk
This will not work from outside the district.
You can send your request via email to email@example.com
This works from within or outside the school district.
To aid in the process explain what the problem appears to be and what you were doing immediately before the problem occurred. More detail is better than less. It helps for the technicians to have some idea of what is going on so that they show up with whatever they need to make repairs.