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Reboot, then Press <b>command r</b> to reinstall the OS once again. &nbsp;If Sierra won't install, try<b> command option r</b> and reinstall your original OS. &nbsp;You may have to erase the disk. &nbsp;If you have data you need, you can boot into Target mode by pressing <b>t</b> and attach it to another Mac as an external disk and transfer the data.
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needed to connect to the internet.
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I was running Lion and wanted to free upgrade to Sierra, after the first boot now it keeps going to the system installation, it won't boot into Lion or Sierra now, what should I do?
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I was running Lion and wanted to free upgrade to Sierra, after the first boot now it keeps going to the system installation, it won't boot into Lion or Sierra now, what should I do?

MAC Sierra booting into system installation .

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.