STM32F407G-DISC1 unable to be found on STMCube IDE

[Nhat]

Hi, I'm having trouble when debugging the STM32 project. The board was connected to my laptop, however, on the IDE I can not find the option to debug on the target board. 
I bought this board a month ago and debugged it only a few times before.
Please help me to solve this problem, thank you very much.

 

[KDJEM.1]

Hello @Nhat and welcome to the community,

 

I apologize for my late reply.

Could you please click on "Debug Configuration"-> "Debugger" tab,  and click on ST-LINK S/N and scan as shown in the below figures.

 

Could you please try with another cable?

I hope this help you!

Thank you.

Kaouthar