My hard drive's pcb was defected and after the search on the internet I found the www.onepcbsolution.com and ordered the pcb which is completely the same as mine. The boards showed up yesterday and works perfectly. Many thanks for their help and also thanks for the screwdriver on the package. I wrote all this things to inform you. If you have the problem with your harddisk pcb you can undoubtly visit that site. Thanks again.