MacBook Pro crashes during boot I'm having the following problems:


after latest El Capitan update, my Macbook Pro (mid 2010) crashes (turns off) during boot.
I'm unable to boot in safe mode, the only way is recovery mode.
I've ran disk utility with ok results.
I've done PRAM reset with no effect.
I'm trying to reinstall El Capitan as a last resort but I'm getting the following error message: "An error occured while preparing the installation. Try running this application again."


Currently I'm really stuck in the middle of nowhere, everything I've tried goes terribly wrong and I have no clue what is going on.

Please help,

Thanks.
There most common cause for this error, is a time/date issue.

If you notice the time and date are wrong during the installation, try the following:

https://apple.stackexchange.com/a/166746/164066

There's more info on the error here:
http://osxdaily.com/2015/01/19/fix-os-x-install-errors-cant-be-verified-error-occurred-preparing-mac/