First off sorry for the long post I just want to be as detailed as possible.So I recently ordered a new harddrive for my 60gb macbook becuase of space constraints. I decided to buy this harddrive https://eshop.macsales.com/Search/S...ok+Drive+with+8MB+Cache&x=0&y=0&Manufacturer= , which basicallly is a 160 gb from www.owc.com and swap this with my 60gb internal and use my 60gb internal that came with my macbook as my new external. After installing the 160gb harddrive into my computer it was never really working perfect. When ever I was downloading anything or transfering from my old 60gb (now)external harddrive the new 160gb internal would start downloading or transfering files ok but about half way through the 160gb internal harddrive would start to make a clicking noise and soon after my computer would just freeze up. I would shut it down and try again and it would seem to work ok...until I needed to download something again, this was about two weeks ago. But just recently I couldnt even get to my OS when I would turn the computer on. AllI would get was the blue screen with the apple logo and the spinning cirlce underneath it and then it would just shutdown. I hooked up my 60gb external to the computer and was able to get to disk utility through that. When I ran the first aid in the disk utility and ran the "verify disk" on the 160gb internal hard drive and I got this message... First aid falied, Invalived sibling link, the volume Macintosh HD needs to be repaired, 1HFS volume checked, Volume needs repair. I then clicked on "repair disk" . When I did that I got half way through repair and then got this message...Invalide sibling link, volume check failed, error:the underlying task repair failure on exit, 1 HFS volume check, 1 volume could not be repaired becuase of an error. After this i decided to just erase the harddrive and start fresh since I have everything backed up on my 60gb external. So I erased everything and then ran the first aid. I was able to "verify disk" just fine so I didnt need any repair. After this I was able to download off the mac osx install cd and getmac osx loaded (with a hicup or two, i.e. half way through downloading it would make the clicking noise and then I restarted the whole process over again). When I finally got everything downloaded and got back to mac osx through the 160gb internal harddrive I plugged in my external, which it recognized and when I started transfering all my files over it would get about 1/4th of the way through the process it would start making the clicking noise again, so I shut down and restarted but it just did the same thing again. Does anybody have any ideas as too why this might be happening or what I can do? Once again so sorry for the long post and thank you so much for taking the time to help me out.