My laptop shutdown by it self

I’m sorry to hear that your Lenovo E41-45 laptop is experiencing issues. According to Lenovo Support, if your laptop is not turning on, there are a few steps you can take to try to diagnose the problem and get it running again:

1. Try recharging the battery.
2. Check the power source, power adapter, and power cable.
3. If the PC does not power on, perform a power drain.
4. If the system still does not power on, try waking it up from sleep or hibernate mode.
5. If the screen is too dark, the computer may appear to be powered down.
6. Remove the PC from any docking stations.
7. Check the monitor.
8. Try Safe Mode ¹.

If your laptop shut down by itself, it could be due to overheating or malfunctioning software ². Examine the laptop’s connector and the AC adapter’s output connector for damage. Whether the input connection on the Ac to dc adapter is broken, examine if the situation remains ².

If none of these steps help, it’s possible that there is a hardware issue with your laptop’s battery or other components. In that case, it’s best to take your laptop to a professional repair service.

I hope this helps!