Hey guys just installed a new HDD into a macbook pro that was dropped. Seems fine, loads the disk and then says it can install the OS, i load up disk utility and theres no hard drive int he list just the optical drive and the DVD, its not the disk that came with the mac itself its either my proper retail one or the one that came with my personal older macbook which might be the issue. Ive taken apart and reconnected the HDD and all seems fine internally. Are there any issues that cause this except not using a full retail disk which im going to try later on, just wanted to rule everything else out. thanks !