Simple Tech collaspe. I went to turn on the hard-drive and it comes on then it gives me three

Question

I went to turn on the hard-drive and it comes on then it gives me three clicks sound and the red light flashing. I bought it to a place that fixes computers and they couldn't get anything to even run a diagnostic. I really need to know what to do. I have many music projects on the hard-drive and i don't know if all is lost. What do I do?