![]() ![]() If there is a second MAC available, a Target Disk Mode boot ( press T while powering up the mac with the new drive) may allow the second working mac to format the new drive via Disk Utility. What brand/model is this new drive? Is it an SSD? It may require a FW upgrade. If you have a external cable SATA-to-USB or SATA-to-FW (very unlikely), format the new drive using a different PC/MAC to make sure it is not DoA. The non-drive end of SATA/IR Sensor cable on the main logic board could be loose or damaged. The cable could have been damaged during the replacement. Pulling the drive out and putting it back is fairly easy in the 2011/2012 MBPs. If the drive is not recognized when plugged into the internal SATA bus, either a cable is not plugged in properly (the replacement drive never showed up successfully as per the OP even once, or the drive is DoA). Can you try Internet recovery via Ethernet cable, if all your previous attempts have been via WiFi? If neither is available, or is spotty, Internet Recovery will not work. ![]() Looks like it starts erasing, but then quits and says at least one volume could not be unmounted. Couldn’t repair, said to reformat, but couldn’t erase anything either. It requires an Ethernet or WiFi connection. Tried everything under disk utility, couldn’t unmounted disk or said couldn’t open disk, depending which disk. if Internet Recovery worked once, the MBP is already capable of repeating it. You can use an external USB disk/flash drive which has Recovery (or a full OS - requires a 16GB disk space on a USB flash or a JHFS+ partition with the OSX) on it.
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