Make sure the computer is ready to be shut off before turning off the computer.
If you have a laptop computer make sure the battery is charged before disconnecting the power connection.
If your computer cannot connect successfully to the various components you want to use, you may experience weird issues that are hard to resolve within the operating system's preferences.If the BIOS cannot communicate successfully with your computer's USB interface you may experience USB dropouts when using Serato software. Just like the drivers for your computer's internal hardware the updates for the BIOS are provided by the manufacturer.With Mac computers, the machine is manufactured by Apple so the updates for their EFI chip are rolled into their general OS updates.Sometimes leaving the computer can re-charge the battery.
If the computer lost power while it was still running it may have corrupted the CMOS.
Even if a computer is “brand new” it may not have the latest BIOS loaded when it is shipped.