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Unable to login with my normal username & password after crash

About a week ago, I got a "service battery" notification, after I let the battery discharge completely.

The other night, the system abruptly shut down while running on battery power, at 40% remaining charge.

I plugged the power adapter in, waited for the battery to recharge, and attempted to re-boot: it took over an hour.

When I did get the login screen to display, I noticed that my user picture was missing, and I am unable to login using my username/password, as if my user profile has been deleted. Also, the system beachballs at the login screen, while attempting to enter data, or while using the trackpad. I see no option for logging in as a new user.

I have reset the PRAM, and attempted to restart in Safe Mode, but still experience the same problem. I ran Disk First Aid and everything checks out fine...I replaced the HD about a month ago, and it should be ok.

I am now thinking about re-installing the OS, however, I ordered a new battery that will arrive day after tomorrow: Should I wait, and install the new battery BEFORE attempting to reinstall the system software? Or, should I just try to reinstall now?

Could the battery itself be the root of these problems?

Any advice is much appreciated...thanks in advance!

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Do you have another PC that you could use for something?

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Yes...I'm using a linux-based Eeepc to write this, now.

My 13" MacBook Pro is a late 2011 A1278, running 10.13.

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Would you have any way of connecting the hard drive from your "crashed" pc to your Linux box, like a hard drive dock?

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OK. linux has built in HFS+ read capabilities, so we can skip installing paragon HFS+. Connect the Mac hdd to the Linux PC and boot into linux off your linux drive. NOT THE MAC DRIVE.

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Oh its a laptop.

Do you have a SATA to USB adapter?

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You're hitting the classic case of a bad HD SATA cable. This is a common issue within the 13" models as the uppercase is a bit rough and damages the cable. Here's the IFIXIT guide you'll need to follow: MacBook Pro 13" Unibody Late 2011 Hard Drive Cable Replacement and this is the cable you want: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable The 2012 cable is better built. Even still I would apply some electricians tape where the cable rests.

Now as you already know you have a bad battery I would download this great app to see if thats the only thing here: CoconutBattery. Post a screenshot of the main window and paste it here for us to see to double check things for you.

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And lastly review this great Apple T/N: Apple Portables: Troubleshooting MagSafe adapters

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable图片

产品

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable

$34.99

MacBook Pro 13" Unibody Late 2011 Hard Drive Cable图片

指南

MacBook Pro 13" Unibody Late 2011 Hard Drive Cable Replacement

难度:

中等

20 - 30 minutes

iFixit图片

指南

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难度:

非常容易

2 - 5 minutes

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its highly unlikely the battery cause a software problem. I would reinstall OS (fresh install). battery will not make a difference in that regard.

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if he has another PC (preferably windows) he could get his data off.

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I do have a USB to SATA adapter that I used to try to recover the files from the old HD that I replaced a month or so, ago.

According to Disk First Aid, the new HD is working normally, and is mostly empty.

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