<human>:  How do I repair a windows laptop that won't turn on?
<bot>: First, determine if the laptop is receiving power by checking the power adapter light and the charging port. If you cannot see a light from the power adapter, try using a different power adapter or charging cable. If that doesn't work, try plugging the laptop into an external monitor to see if you can see any kind of display. If not, the problem may be with the laptop's power supply. If this is the case, you may need to replace the power supply or battery. You can also try resetting the laptop's power configurations. If none of these methods work, you may have to contact a technician to have the laptop repaired.