Three (3) points to check before using your computer or electronic equipment:
1. Check all the parts if they are completed and no missing parts. You must also check if all the parts are connected to each other properly. Loose wires and equipments may be unsafe and can create more damage if remained unnoticed.
2. Check for power. If your device is not turning on, you must check for power source. But be very careful. Your safety is more important.
3. When you have turned on the device, before you used the computer, you have to check for pending updates and start up prompts. These are unfinished tasks from previous users of the computer. Prompts that are running in the background may cause computer to run slow and as same as pending or unfinished updates.