What should I check if my computer will not turn on?

Check power, cables, displays, docking equipment, and visible error indicators before deeper repair.

Answer

Confirm the power source works, reseat the power adapter, disconnect nonessential accessories, and check whether lights or fans respond. For desktops, verify the monitor is powered and connected to the correct output. Stop and seek support if there is liquid exposure, burning odor, unusual heat, swelling, or repeated electrical clicking.