fegsdc wrote:
I didn't manage to upload the newest or a newer version of MacOS because I do not have another Mac available. So I loaded the old version MacOS X Lion on the Macbook Pro.. but the thing is my daughter can't play Roblox on it. Also many apps don't work on it and I get some errors.
Does this mean that you have Lion running on the laptop?
If the laptop is booting Lion make sure all updates have been download so Lion is at version 10.7.5, then download the macOS 10.13 High Sierra installer using these instructions:
https://support.apple.com/kb/HT208969
I would suggest creating a bootable macOS USB installer while you can still boot into macOS Lion. Using the macOS USB installer will most likely work out better anyway. Here are the instructions for creating a bootable macOS USB installer:
https://support.apple.com/en-us/HT201372
What happened to my external hard drive is that I formatted it on my windows PC first and then a second time on that Macbooc Pro OS when the loading error occured.....know what I mean? The same error that appears on the link i sent previously regarding loading an OS.
Should I try "fixing"/recuperating my external hard drive using that Macbook Pro since formatting was the last thing I did on it? If yes, how to do it?
Like i said before I am unable to recuperate/re-format my Seagate external hard drive now (on windows 7) and I don't know what to do to fix it....It is almost 2TB. Hope you guys understand what i'm trying to say...
If the laptop is booting to macOS, then you should be able to properly erase the external drive for use on the Mac. You just need to make sure to select the physical drive to erase and not a volume/partition. If you can select the physical drive erase it as GUID partition and MacOS Extended (Journaled).
If you are booted to Lion, then instead of using the "Erase" tab you need to select the "Partition" tab instead after selecting the physical external drive in the left pane of Disk Utility. Then click on the drop down list box and select "1 Partition". Click on the "Options" or "Advanced" button and make sure that "GUID Partition" is selected and click "OK". Now back at the partitioning tab again make sure the file system selected is "MacOS Extended (Journaled)". Give the external drive a name as the default name will most likely be "Untitled". Once everything is ready click on "Apply". The external drive now should contain one properly erased volume suitable for use with macOS.
NOTE: erasing the drive will destroy all data on the drive.
Sometimes macOS does have problems seeing and erasing drives if they are in an unexpected configuration. It is also possible a 2TB drive may not be compatible with Lion. The technology on hard drives changed beginning with the 2TB drives so Lion may not be able to see or access a 2TB or larger drive.
As for using Windows I've heard people using the paid app TransMac to create a bootable USB installer, but I've also seen people have issues being unable to boot their Macs with the USB installer created with TransMac. I have no personal experience with TransMac.