Hello!Thank you for your question. I am Shefin and I look forward to helping you with your issue today.
May I know the make and model number of the mouse?
The light will blink as green if the battery is good. have you tried different batteries?
May I know the operating system you are using? Is it Windows 7?
S H E F I N
First, remove the USB receiver from your computer and insert it to a different port.
If you have a mouse driver disc, install the driver using the disc. Check all other USB devices works fine with your computer.
Please remove the batteries from the mouse. Wait for two minutes. Insert the batteries and let mouse stop the blinking. Then, press the scroll button and check if it is working fine.