re: problem with macbook pro retina on startup. help

when you launch into time machine go to disk utility and verify the disk. Likely you will see errors on the disk. Try to repair it, if that doesn't work your hard drive probably has a critical error you need to go to the apple store if it is under warrantee, if not under warrantee fix it yourself, unless you want to spend a little more money and let them fix it.

Also do you have a OS X disk?