How to troubleshoot CentOS stuck at the startup screen?

When CentOS gets stuck at the boot screen, it may be due to various reasons. Here are some common troubleshooting methods:

1. Check hardware malfunctions: First, make sure your hardware is not faulty. Check if the power supply is working properly and ensure all hardware connections are correct. You can try reinserting hardware devices (such as memory, hard disk, etc.) to ensure they are properly connected.
2. Check the boot order: In the BIOS, check the boot order to ensure that the hard drive is the first boot option. Sometimes, if the boot order is not set correctly, it can cause the system to fail to boot from the hard drive.
3. Check the file system: You can try using a Live CD or USB to boot, then check and repair the CentOS file system. You can use the CHKDSK command (in Windows) or fsck command (in Linux) to check and repair file system errors.
4. Enable detailed boot logs: Press the ESC key during startup to view CentOS’s boot log. By examining the detailed logs, you may be able to identify where the system is getting stuck and find clues to resolve the issue.
5. Restore to previous working state: If you have recently made changes to system configurations or installed new software/drivers, it may be those changes causing the startup issue. Try restoring to a previous working state by using system snapshots, restoring backups, or rolling back changes.
6. Reinstall or repair: If the above methods do not solve the problem, you may want to consider reinstalling CentOS or using repair tools (such as CentOS’s rescue mode) to fix system files.

If the above methods still do not solve the problem, it is recommended to contact CentOS technical support or seek help from a professional.