Impossible to do El Capitan clean install, Mavericks boot screen broken!

[bruitmonkey]

Hi!
I have a cMP 4.1 -> 5.1 with Mavericks 10.9.5 installed. All the original hardware except Intel Xeon W3690.
Made a bootable El Capitan install usb, but it does not show up in Startup Disk selection screen.
When I try to hold down the Option key while booting, Mac hangs on white screen..
The same USB instalation shows up in Yosemite boot screen on my MacBook Pro.
Tried PRAM reset and NVRAM reset, nothing works. Mavericks boot selection screen is just broken!

So do I have to update Mavericks to El Capitan and then do a clean install? It just takes twice as much time..

 

[bruitmonkey]

Bump!

 

[RedRaven571]

I'm sorry but I can't speak to your exact problem.

I did a clean install, Mavericks to El Capitan, on mid 2012 cMBP using a USB Install and the only issue I had was the install hanging at the 'one second left' message which I solved by starting over with wifi switched off, as was suggested by an online post.

Not to be stupid, and I don't know if it would make any difference at all, but I made my USB install using Mavericks, following this procedure:

1. Connect to your Mac an 8GB (or larger) drive, open Applications and start the “Disk Utility”. Select the USB drive from the left sidebar and click on the “Erase” tab. Select Mac OS Extended in the box and make sure that you leave “Untitled” as the standard name. Hit the “Erase” button and wait until the formatting of the USB is complete.
   Now you will need to go to the Partition Layout drop-down menu and open the Partition tab.Make sure that the “GUID Partition table” is selected, as the partition scheme and the name are set to “Untitled”.
   (The Terminal commands provided here assume that the drive is named Untitled. If the drive isn’t named Untitled, the procedure won’t work.)
   
2. Make sure the El Capitan installer (or at least a copy of it), called Install OS X El Capitan.app, is in its default location in your main Applications folder (/Applications).
3. Launch Terminal (in /Applications/Utilities).
4. Paste in the following command: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction
5. You will see a list of the program’s tasks as they occur: Copying installer files to disk...Copy complete.Making disk bootable...Copying boot files...Copy complete. The procedure can take as little as a couple minutes, or as long as 20 to 30 minutes, depending on how fast your Mac can copy data to the destination drive. Once you see Copy Complete. Done., as shown in the screenshot above, the process has finished.

 

[bruitmonkey]

I'm sorry but I can't speak to your exact problem.

I did a clean install, Mavericks to El Capitan, on mid 2012 cMBP using a USB Install and the only issue I had was the install hanging at the 'one second left' message which I solved by starting over with wifi switched off, as was suggested by an online post.

Not to be stupid, and I don't know if it would make any difference at all, but I made my USB install using Mavericks, following this procedure:

1. Connect to your Mac an 8GB (or larger) drive, open Applications and start the “Disk Utility”. Select the USB drive from the left sidebar and click on the “Erase” tab. Select Mac OS Extended in the box and make sure that you leave “Untitled” as the standard name. Hit the “Erase” button and wait until the formatting of the USB is complete.
   Now you will need to go to the Partition Layout drop-down menu and open the Partition tab.Make sure that the “GUID Partition table” is selected, as the partition scheme and the name are set to “Untitled”.
   (The Terminal commands provided here assume that the drive is named Untitled. If the drive isn’t named Untitled, the procedure won’t work.)
   
2. Make sure the El Capitan installer (or at least a copy of it), called Install OS X El Capitan.app, is in its default location in your main Applications folder (/Applications).
3. Launch Terminal (in /Applications/Utilities).
4. Paste in the following command: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction
5. You will see a list of the program’s tasks as they occur: Copying installer files to disk...Copy complete.Making disk bootable...Copying boot files...Copy complete. The procedure can take as little as a couple minutes, or as long as 20 to 30 minutes, depending on how fast your Mac can copy data to the destination drive. Once you see Copy Complete. Done., as shown in the screenshot above, the process has finished.

I made my El Capitan insllation USB the same exact way! Twice, just to be sure there were no errors during that process.

 

[hwojtek]

So do I have to update Mavericks to El Capitan and then do a clean install? It just takes twice as much time..

About 25 minutes each, you'd be finished by about now if you started when you were writing down the idea
Also, you might try to create the bootable USB on another computer.

 

[bruitmonkey]

About 25 minutes each, you'd be finished by about now if you started when you were writing down the idea
Also, you might try to create the bootable USB on another computer.

I made the installation USB the next day El Capitan was released.

 

[RedRaven571]

Also, you might try to create the bootable USB on another computer.

This is certainly worth a try, I would think.....

 

[kristiguin]

I'm sorry but I can't speak to your exact problem.

I did a clean install, Mavericks to El Capitan, on mid 2012 cMBP using a USB Install and the only issue I had was the install hanging at the 'one second left' message which I solved by starting over with wifi switched off, as was suggested by an online post.

I'm having this same problem. How do I switch off the WIFI so I can continue?

 

[RedRaven571]

I'm having this same problem. How do I switch off the WIFI so I can continue?

When you boot from your installer and choose to install El Cap, in the task bar on top of screen, is the wifi fan icon, click on it and turn off wifi, then proceed with install. Frankly, after doing multiple installs since Leopard, I had never noticed the wifi icon up there....