My PC won't turn on

Usually it's a switch or a cable. Sometimes a cable inside works loose in shipping.

1. Flip the power supply switch
   Set the switch on the back of the power supply to I (on). It's right next to where the power cable plugs in.
2. Check the outlet
   Push the power cable in firmly at both ends. Plug it into a wall outlet you know works, and skip any power strip that might be switched off.
3. Press the power button
   Press the power button on the case once, then give it a few seconds.
4. Reseat the power cables inside
   Switch off and unplug the PC, then remove the glass side panel. Press firmly on the wide power cable on the right edge of the motherboard and the smaller one in its top-left corner, so both are fully plugged in. Put the panel back and try again.