orange Led always blinking

Hi,
I bought an ARDUINO UNO, since I connected it to PC, the orange led is blinking. I can send it codes without problems. but led continues blinking.
What can I do? Is it normal?
Thanks

lodea:
I can send it codes without problems. but led continues blinking.

You sure about that? What "codes" are you sending it?

"Uploading done" does not always mean a successful upload.

If the L LED's blink rate doesn't change when you upload a program, the program did not upload.