Trying the obvious

Most of my support calls seem to be a case of users not engaging their brain before pressing the panic button.

In my experience 90% of faults are due to something trivial, such as loose leads and the such like. Please check before calling. It is one of the first checks I will carry out when arriving to fix your problem.

What to check:

All the leads at the back of the PC are plugged in correctly (Monitor/Keyboard/Mouse/Power/Printer/USB etc)

That there is actually power going through to the socket where the PC is plugged in (if it appears completely dead).