Serial Port Blocked

I cant find my arduino leonardp COM port on device manager or in Arduino IDE.
I dont know what to do??!!
It was working b4 perfectly but now i have lost my COM Port anf I got this error mesg Couldn’t find a Leonardo on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board’s reset button after initiating the upload. at at at at at at$ at

did you try to close and restart the IDE?

yes i did. I even restart the computer. but i still didnt find the Com port