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It is recommended to keep a computer on overnight to ensure it gets group policy and software. Computers are re-imaged with base windows and SCCM pushes out software to appropriate computers. Coordinate any special software that needs to be installed via a ticket.
Due to security concerns, we do not re-image computers via flash drives anymore. If we can't boot to PXE, we may come up with an alternative means. They are not readily available and may need to be created.