Make the frame taller?
@EsamEmam, are you using any IME (input types) to type different language within the text frame? If so then check if your cursor is blinking within the IME. Are you on Windows or Mac? Have you modified the keyboard preferences of InDesign in the past?
Which version do you use?
What are the keep settings in your paragraph style when this happens?
Do you know the difference between ENTER and RETURN? Enter is in the numeric part and makes a column break, Return is in the right edge of the ABC part and makes a new paragraph.
thank you for your concern, actually I don't know what happend, the cursor is working properly now.
what is IME?
I'm using cs6, and I'm on windows, I'v not modified the keyboard preferences of InDesign in the past.