A dead or dying PRAM battery can prevent a Mac from booting or cause erratic behavior.
If the date and time reset each time you unplug the Mac you need a new PRAM battery. These steps should get you going on the right direction.Macs also have another battery, called the PRAM (or NV-RAM) battery, that saves things like network settings, choice of startup drive, etc. More than likely the EFI partition was hosed, not the root volume (Macintosh HD). The flashing folder with question mark means it can't find a boot volume. (That drive identifier doesn't make sense it should be disk0 in a MacBook). This is why they end up with "nothing worked."įinally erasing just a slice (disk2s1) wouldn't be sufficient. Many folks try "solutions" they find on the internet without identifying the problem first. Once you figure things out, then start with solutions. Use a tool like DiskDrill or Disk Warrior to do a proper test on the drive. However, it could be off and you still have a major problem. If it's on, there's definitely something wrong. It's analogous to the check engine light on a car (mechanics call it an idiot light).
If it comes back as anything but "Verified" it's pretty much guaranteed to be failing but a positive result (Verified) could be hiding a failure. Regarding SMART status, it's not an accurate tool. If that's the case, upgrade the drive to an SSD to increase the performance. By doing this you will confirm whether it is the drive or not because if it boots properly, the MacBook would be fine since it can boot off of alternate media. Do this by installing a clean version of macOS onto a USB flash drive (32GB is sufficient) and booting from that. You need to narrow down the possible failure points. I gather from reading the replies you have a MacBook Pro with a spinning hard drive (it is helpful to put this info in the OP so we don't have to hunt).
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