avrdude: stk500_recv(): programmer is not responding

I have an Arduino uno R3 module with a ATmega328p chip. But when I plug my Arduino to my PC nothing happens, but it used to work. I dont even hear the sound it should make when connected, it wont find the port. Only thing that happens is that the ''ON'' lights up green and the ''L'' lights up orange when i connect it. What do you think the problem is, and how could i fix it? Thank you!