This guide is a complete walkthrough for installing OS X 10.10 Yosemite to Dell Inspiron i13z-7729RED.
Make a bootable OS X 10.10 Yosemite installer usb drive
Check this tutorial:
How to make a bootable OS X 10.10 Yosemite install usb drive
Step 2: Set up BIOS settings of Dell Inspiron i13z-7729RED
If you’re installing on a desktop with AMI UEFI BIOS, the options are simple. Here are standard AMI UEFI BIOS settings for Gigabyte AMI UEFI BIOS, Gigabyte AWARD BIOS, ASUS AMI UEFI BIOS, and MSI AMI UEFI BIOS.
To access BIOS/UEFI Setup, press and hold Delete on a USB Keyboard while the system is booting up and Load Optimized Defaults.
1, If your system has Secure Boot Mode, disable it
2, If your system has CFG-Lock, disable it
3, If your CPU supports VT-d, disable it
4, Set OS Type to Other OS
5, Save and exit.
For other BIOS, please set your BIOS to Optimized Defaults, and the hard drive to AHCI mode.
Step 3: boot from the USB drive and install to Dell Inspiron i13z-7729RED
1. Turn on your computer, press the hotkey to choose boot device (usually F12), Choose USB and Enter.
If you have trouble reaching the Yosemite installer, type -x at the Boot screen as below.
2. When you arrive at the Installer, choose language.
3. For a new installation of OS X, you have to erase and format the destination drive according to the following steps before continuing.
c. Click Partition tab
d. Click Current and choose 1 Partition
e. Click Options…
f. Choose GUID Partition Method
g. Under Name: type Yosemite (You can rename it later)
h. Under Format: choose Mac OS Extended (Journaled)
i. Click Apply then Partition
j. Close Disk Utility
5. Upon completion, restart the system.