How to repair a hard disk if a pin has been broken?

Hello everybody,
I have a Maxtor 160 Gigabyte ID HDD. I kept so many important files in it. Last day I opened the id cable of that HDD which is used to connect it to the motherboard. At the time of opening the cable, one of the id pin was accidentally broken by me.
When I reconnected the hard disk with the motherboard, I was not working. My system failed to boot any data from that hard disk. It’s a very big problem for me. I have so many important files in it.
I will be in a big trouble if I fail to recover the data from it as I kept a lot of important files of my office work. Is there any other way to recover the data from my hard disk or is there any solution to repair it? I showed that hard disk to a mechanic who use to repair such electronic devices.
But, he said that he would fail to repair that hard disk. But I think there must be a way to repair it. Friends, has anybody ever experienced this sort of difficult problem? If you solved it. Please help me?
I will be very thankful to him.
Thank you for reading my problem carefully.
