Booting issues might be caused by a problematic power supply.
Power-supply problems need to be quickly diagnosed, because faulty power could cause problems in your entire system. One of the most obvious symptoms of a power-supply failure is your computer not starting. The power supply might not be at fault and some testing is required to pin the problem entirely on a faulty-power supply.
Instructions
1. Check the power supply's physical connection on the back of the computer. Push the power cable into its slot all the way and try to turn on your computer. The cable might have been loose in its power slot and wasn't able to get enough power to turn on.
2. Remove the power cable from your computer and open the case. Computer cases come in many different styles, so you might need to slide a side panel or unscrew retaining screws on the case to get it open.
3. Check the power supply for burn marks, an acrid or ozone smell or obvious physical damage. The power supply would need to be replaced if it is physically damaged because it is a danger to you and your computer.
4. Use canned air to clean out the power supply's fan. The power supply might just be overheating due to a dirty fan.
5. Examine the power-supply cable leading to the motherboard. Remove the power connector on the motherboard, clean the connector with canned air, and reinsert it to ensure the physical connection is not the issue.
Tags: power supply, your computer, Check power, Check power supply, physical connection