How to fix Display Resolution Mac OS X on VirtualBox without Bootloader

Written by John

You’ve just installed Mac OS X into VirtualBox, Unfortunately the only options showing for screen resolution are 640×480 and 800×600. How would I go about upping the resolution to 1280×1024, 1440×900, 1900×1200 or Higher. Today, I’ll show you How To Fix display resolution Mac OS X on Virtualbox without bootloader

Virtual Machine Name and OS Type
Name: Mac OS X 10.10 YOSEMITE
Operating System: Mac OS X
Version: Mac OS X YOSEMITE
Enable virtualization in BIOS HOST computer (VT-x)
Memory 2560 MB (minimum)
Virtual Disk Size: 40GB (or more)
Extended Features: Enable IO APIC
Extended Features: Enable EFI

System VirtualBox

                                                                            System VirtualBox

Step 1: Open the Command Prompt (cmd) in Windows with Run as Administrator

Close your VirtualBox – opening the Start Menu – and typing “cmd” into the Start Menu search bar – Right Click Run as administrator

Command Prompt

                                                                Command Prompt

Step 2: Add Code to VirtualBox

Paste this Code to cmd:
cd “C:\Program Files\Oracle\Virtualbox”
VBoxManage setextradata “Mac OS X 10.10 YOSEMITE” VBoxInternal2/EfiGopMode 4
Where N can be one of 0,1,2,3,4,5 referring to the 640×480, 800×600, 1024×768, 1280×1024, 1440×900, 1900×1200

Add code to cmd

                                                                                 Add code to cmd

About the author


Hi. I am very happy to welcome you my friends. Myself John, and I am a founder & admin of I love to spend time to writing useful tech posts for people and that is the main reason behind the development of the blog. Blogging is my hobby and I am doing it for part time. I am full time worker who is working as an administrator in system & network.


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