If you changed anything on the pc after you booted it, reboot one more time to make sure you have not caused a problem with the boot
2. allow the customer enough time to be fully satisfied that all is working.
3. if you backed up data before working on the problem and then restored the data from backups, ask the user to verify that the data is fully restored.
4. review the service call with the customer. summarize the instructions and explanations you have given during the call. ask if customer as any questions.
5. explain preventative maintenance to the customer (such as deleting temporary files from the hard drive or cleaning the mouse)