Dell Optiplex 780: Service Tag/Serial Number
The service tag/serial number for the box/machine can be found in 2 places on the Dell Optiplex 780.
In this example the service tag number is 167L22S.
- On the side for easy viewing; and
- On the rear where the peripheral cables and power supply are plugged in.
Please note that the monitor serial number also needs to be recorded.