Yosemite broke my Macbook

[scy0846]

I installed Yosemite, yes without a backup, but seeing as how I can't get to the recovery, internet recovery, or safeboot screens(or for that matter see a screen), I don't think that's the issue. I tried to reset the nv ram with cmd+option+p+r. That didn't work. I know it boots. I hear the harddrive running. I cannot use any external screen on hdmi or thunderbolt. All I see is a fully blank screen not even a mouse. I know I can get to terminal if anyone has any ideas to run on terminal.

 

[mikecwest]

Did you try reseting your SMC?

http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US

You can also try OPTION_CMD:R while booting.

Try holding down OPTION while starting as well.

 

[scy0846]

Yep I've tried all three, but they didn't work

 

[chabig]

Turn up the screen brightness. That might 'fix' it. Also, what kind of startup sounds do you hear?

 

[Bruno09]

I think I would try this :

- boot in single user mode (Cmd + s on chime)

sudo bless -mount /Volumes/"Macintosh HD" -setBoot

Enter

shutdown -h now

Enter (to shut down the Mac)

However, since I never used this in single user mode, please wait for someone else to "bless" this thought.

 

[scy0846]

I hear the initial startup sound and the harddrive running. I know I can even call up terminal because of the cmd+spacebar and I tried sudo pmset -b gpuswitch 1 then sudo shutdown -r now and it restarted.

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none of the solutions worked. Thanks for your help. This is a weird situation

 

[Bruno09]

You might also try :

sudo bless -folder /Volumes/"Macintosh HD"/System/Library/CoreServices

In these command lines, you must replace "Macintosh HD" with the actual name of the partition.
Use the quotes if the name has one or more space.

If you named the volume "Yosemite" :

sudo bless -folder /Volumes/Yosemite/System/Library/CoreServices

 

[scy0846]

I think it's macintosh hd, however since my screen won't come on I'm literally doing everything blind

 

[Bruno09]

Sorry, I forgot something important, indeed.

When you start in SU mode, you need to mount the volumes first.

- Cmd + s on chime

/sbin/mount -uw /

sudo bless -mount /Volumes/"Macintosh HD" -setBoot

sudo bless -folder /Volumes/"Macintosh HD"/System/Library/CoreServices

shutdown -h now

I am not a Terminal guy, so take this with a grain of salt.

None of these commands can harm, though.

 

[scy0846]

Anyway to install Mavericks without being able to boot to recovery?

 

[w0lf]

If you can get to terminal you could download and install anything.

 

[scy0846]

If I knew commands to reinstall the os I would but again I am running blind

 

[w0lf]

If I knew commands to reinstall the os I would but again I am running blind

# Download installer
curl -L -o ~/test_yose.dmg "direct download link that I can't share but google will easily find"

# Mount dmg
hdiutil attach ~/test_yose.dmg

# Move app to some place with rw permission
cp -r /Volumes/test_yose/Install\ OS\ X\ 10.10\ Developer\ Preview.app ~/install_yose.app

# Open installer
open ~/install_yose.app

Then I assume just pray you can get through the install dialog by pressing return a bunch.

 

[benthewraith]

I installed Yosemite, yes without a backup, but seeing as how I can't get to the recovery, internet recovery, or safeboot screens(or for that matter see a screen), I don't think that's the issue. I tried to reset the nv ram with cmd+option+p+r. That didn't work. I know it boots. I hear the harddrive running. I cannot use any external screen on hdmi or thunderbolt. All I see is a fully blank screen not even a mouse. I know I can get to terminal if anyone has any ideas to run on terminal.

I'm going to be honest, even though you were installing Yosemite, that looks like a hardware problem. The Genius Bar should be able to diagnose it--they'll either wipe the drive and reinstall Mavericks (if there's nothing wrong) or perform a logic board replacement and reinstall Mavericks (assuming laptop is under warranty).