If your Linux system hangs when configuring the ATI HD3750 graphics driver, it could be due to a number of issues. Some common causes of this problem include:
Hardware issues: Make sure that your graphics card is properly installed and seated in the motherboard, and that the card is compatible with your system.
Kernel issues: If you are using a custom kernel, it is possible that the kernel is not compatible with the graphics driver. Try using a different kernel or a stock kernel to see if that fixes the problem.
Driver issues: Make sure that you are using the correct driver for your graphics card. You can check the manufacturer's website for the latest driver for your card.
Configuration issues: If you are manually configuring the graphics driver, it is possible that you have made a mistake in the configuration. Check your configuration file for any errors or typos.
System instability: If your system is experiencing other issues or is not stable, it could cause the graphics driver configuration to hang. Make sure that your system is up to date and running smoothly.
If you have tried all of these troubleshooting steps and the problem persists, you may need to seek additional help from the community or from the manufacturer of your graphics card.