Based on the previous actions taken, it seems that the laptop has undergone basic maintenance procedures like formatting and replacing the thermal paste. If the laptop is still freezing after these, it may indicate a hardware issue or a deeper software problem.
Here are some possible solutions that you can try:
1. Check the hardware components - If the laptop is still under warranty, it is recommended to bring it back to the service center and have it checked thoroughly. It could be that there is a problem with the hard drive, RAM, or other components of the laptop that need to be replaced.
2. Update drivers and firmware - Make sure that all the drivers and firmware are updated to the latest version. This can be done by visiting the manufacturer's website and checking for updates specific to the laptop's model.
3. Check for malware - Run a full system scan using a reputable antivirus software. Malware could be causing the laptop to freeze.
4. Disable unnecessary startup programs - Some programs may be causing the laptop to freeze when they start up. Open the Task Manager and disable any unnecessary startup programs.
5. Adjust power settings - Modify the power settings to optimize performance. Sometimes, the laptop freezes because it is not getting enough power from the battery or the power source.
6. Reinstall the operating system - If all else fails, try reinstalling the operating system. This can help fix any software-related issues that are causing the laptop to freeze.
It is important to remember that if you are not familiar with hardware or software troubleshooting, it is best to seek assistance from a professional technician to avoid causing more damage to the laptop.