Code shows on the left on computer screen when starting up then the computer restarts

I was using my macbook pro 13" and my safari unexpectedly closed from there my laptop went off and restarted, when it started up, the progress bar never finished loading before it went off again, this happened twice and after that when my laptop started it showed some kind of code on the left side of the startup page where the grey apple sign is and would afterwards go off and repeat the same thing. I tried booting it into safe mode but it only refused and would do the whole code and restarting thing. Before this my laptop had a problem in which it didn't start up and showed a dim light when charging, I fixed it by opening up the back to unplug and plug the battery connector it was working fine for two days and started acting like this just this evening. I haven't had this computer for up to a year and haven't had any problems with it, I haven't dropped it or spilled anything on it before, it just started acting up and I don't know why. If anyone has a solution to what I can do to fix my laptop please share. Thanks.

To save files you have to install the OS on another drive, like an external HD, and then try to copy or migrate files from the installed HD. Then yo can try to format the installed HD and reinstall the OS.
However, the install HD may not be able to be formatted and you may have to replace it.

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