Help please!

[Namsaknoi]

Hello guys!

First of all, please excuse my english, this is a french guy speaking to you...

Here is my problem:

I upgraded my Mac to Yosemite. Then I created a new admin user, and I deleted the previous one, the thing is that I also deleted the "main folder". After that, when I started my laptop, I had a folder with question mark flashing. I reinstalled OS X from internet, but I wasn't able to find the Macintosh HD disk! So I installed it on a external hard drive. Now I can access my computer, but I still boot on the external hard drive and I am not able anymore to find the Macintosh HD! We tried many things, boot with cmd + s, cmd + r, option, fsck...Nothing works!

Can you please help me, this is very problematic...Thank you soo much!

 

[Bending Pixels]

Sounds like something got borked (slang for "really screwed up").

My recommendation - download Yosemite again from the App Store and create a USB install drive.

If there's anything on the internal HD, copy it to your external HD.

Once that's done, boot to the USB install drive (reboot and hold the Option key) and choose the Yosemite install drive to boot to. Go into disk utilities, erase, and then repartition the internal hard drive (name it Macintosh HD), and then do a clean install of Yosemite.

You'll need to redownload all of your app's and stuff. Hope this helps.

 

[Namsaknoi]

Thank you very much!! But the thing is that I can not see any internal disk in the utilities and anywhere else, I can only see the external hard drive on which I am booting! It doesn't look like my internal disk is broken because this problem coincide with the user's account erase I did just before...