<human>:  My computer crashed unexpectedly, what do I do?
<bot>: First, try restarting the computer. If that doesn't work, check the power source and connections, and try a power cycle. If the computer still won't turn on, check to see if there are any error messages that appear or if any of the components become hot or making loud noises. If none of these steps helps, you may need to contact a professional computer technician to have it looked at.