I had been having a problem with my internal hard drive not being recognised, internally but working externally and so after doing a lot of searching it seemed like it may have been my SATA cable. So I bought a new cable and my original hard drive will work internally, however my upgraded hard drive won't. This is quite strange because both work externally but only one works internally.

Does any have any ideas as to why this might be?

Edit: I have also verified the disk while it is plugged in externally had no problems were found.

Thanks

Mike