I cannot reinstall OS X Yosemite : an error has occured while preparing installation, run setup again

Hello,

I cannot reinstall OS X Yosemite : an error has occured while preparing installation, run setup again

OS X Yosemite 10.10

I have checked the disk for bad sectors. The OS does not start anymore, I standard get the screen with options:

- Restore from time machine
- Install OS X again (see above result)
- Search help online
- Disk tool

Is there a way to clean the whole disk and download OS X to fix a bootable CD / DVD?
AgrippaSenior IT ConsultantAsked:
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strungCommented:
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AgrippaSenior IT ConsultantAuthor Commented:
Hi Strung,

yes sir, that's it: this did the trick:

Set the Mac System Date Manually by Terminal Command
Another approach is to set the date manually from the command line by using the “date” command string, where date is in the [mm][dd]HH]MM[yy] format, which is Month Date Hour Minute Year without any separation. This looks something like:

date 0712122318

For that example, it would set the date as “July 12 2018 at 12:23″.

You can learn more about setting the date with date –help, which also specifies that you can even set the seconds if you want to.

The ‘date’ trick is what you’d want to use if the Mac in question does not have internet access for one reason or another.
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