re-installing macOS Sierra
I have wiped an old Mac and trying to reinstall OS it keeps telling me computer's eligibility will be verified but I press continue and nothing happens
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Not knowing how old the Mac is, you can try Internet Recovery to see if it works. Try booting into Internet Recovery (command - option/alt - R on a restart). It is a slow process. This will install the newest OS that the computer is compatible with. Reformat the drive using Disk Utility/Erase Mac OS Extended (Journaled), then click the Option button and select GUID. Quit Disk Utility. Then install the OS. When the computer restarts, you can use Setup Assistant to restore your data from Time Machine.