diff --git a/src/build_ui.rs b/src/build_ui.rs
index 04504d4..63bf34f 100644
--- a/src/build_ui.rs
+++ b/src/build_ui.rs
@@ -10,12 +10,15 @@ use gdk::Display;
 use gtk::subclass::layout_child;
 use crate::save_window_size;
 use crate::welcome_page;
+use crate::efi_error_page;
 use crate::language_page;
 use crate::eula_page;
 use crate::timezone_page;
 use crate::keyboard_page;
 use crate::partitioning_page;
 
+use std::path::Path;
+
 // build ui function linked to app startup above
 pub fn build_ui(app: &adw::Application) {
 
@@ -89,8 +92,12 @@ pub fn build_ui(app: &adw::Application) {
         .build();
     
     // Add welcome_page.rs as a page for content_stack
-    welcome_page(&window, &content_stack);
-
+    if Path::new("/sys/firmware/efi/efivars").exists() {
+        welcome_page(&window, &content_stack);
+    } else {
+        efi_error_page(&window, &content_stack);
+    }
+    
     // bottom_box moved per page
     // if content_stack visible child becomes NOT content_stack, show the buttom box 
     //content_stack.connect_visible_child_notify(clone!(@weak bottom_box => move |content_stack| {
diff --git a/src/efi_error_page.rs b/src/efi_error_page.rs
new file mode 100644
index 0000000..cb4436f
--- /dev/null
+++ b/src/efi_error_page.rs
@@ -0,0 +1,110 @@
+// Use libraries
+/// Use all gtk4 libraries (gtk4 -> gtk because cargo)
+/// Use all libadwaita libraries (libadwaita -> adw because cargo)
+use gtk::prelude::*;
+use gtk::*;
+use adw::prelude::*;
+use adw::*;
+use glib::*;
+use gdk::Display;
+use gtk::subclass::layout_child;
+
+pub fn efi_error_page(window: &adw::ApplicationWindow, content_stack: &gtk::Stack) {
+   // the header box for the efi_error page
+   let efi_error_main_box = gtk::Box::builder()
+       .orientation(Orientation::Vertical)
+       .build();
+
+   // the header box for the efi_error page
+   let efi_error_header_box = gtk::Box::builder()
+       .orientation(Orientation::Horizontal)
+       .build();
+
+   // the header text for the efi_error page
+   let efi_error_header_text = gtk::Label::builder()
+       .label("Unsupported boot platform")
+       .halign(gtk::Align::End)
+       .hexpand(true)
+       .margin_top(15)
+       .margin_bottom(15)
+       .margin_start(15)
+       .margin_end(5)
+       .build();
+    efi_error_header_text.add_css_class("header_sized_text");
+
+   // the header icon for the efi_error icon
+   let efi_error_header_icon = gtk::Image::builder()
+       .icon_name("emblem-error")
+       .halign(gtk::Align::Start)
+       .hexpand(true)
+       .pixel_size(78)
+       .margin_top(15)
+       .margin_bottom(15)
+       .margin_start(0)
+       .margin_end(15)
+       .build();
+
+   // make efi_error selection box for choosing installation or live media 
+   let efi_error_selection_box = gtk::Box::builder()
+       .orientation(Orientation::Vertical)
+       .margin_bottom(15)
+       .margin_top(15)
+       .margin_start(15)
+       .margin_end(15)
+       .build();
+
+   
+   let efi_error_text = gtk::Label::builder()
+        .vexpand(true)
+        .hexpand(true)
+        .label("PikaOS Only works on GPT UEFI Systems, this machine is booted in CSM/LEGACY mode.")
+        .halign(gtk::Align::Center)
+        .valign(gtk::Align::Center)
+        .build();
+    efi_error_text.add_css_class("big_error_text");
+   
+   let kill_me_button = gtk::Button::builder()
+        .label("Exit")
+        .vexpand(true)
+        .hexpand(true)
+        .halign(gtk::Align::Center)
+        .valign(gtk::Align::Center)
+        .build();
+
+    // / efi_error_selection_box appends
+    
+    // / efi_error_header_box appends
+    //// Add the efi_error page header text and icon
+    efi_error_header_box.append(&efi_error_header_text);
+    efi_error_header_box.append(&efi_error_header_icon);
+    
+    // / efi_error_main_box appends
+    //// Add the efi_error header to efi_error main box
+    efi_error_main_box.append(&efi_error_header_box);
+    //// Add the efi_error selection/page content box to efi_error main box
+    efi_error_main_box.append(&efi_error_selection_box);
+    
+    // Start Appending widgets to boxes
+
+    // / efi_error_selection_box appends
+    //// add live and install media button to efi_error page selections
+    efi_error_selection_box.append(&efi_error_text);
+    efi_error_selection_box.append(&kill_me_button);
+    
+    // / efi_error_header_box appends
+    //// Add the efi_error page header text and icon
+    efi_error_header_box.append(&efi_error_header_text);
+    efi_error_header_box.append(&efi_error_header_icon);
+    
+    // / efi_error_main_box appends
+    //// Add the efi_error header to efi_error main box
+    efi_error_main_box.append(&efi_error_header_box);
+    //// Add the efi_error selection/page content box to efi_error main box
+    efi_error_main_box.append(&efi_error_selection_box);
+
+    // / Content stack appends
+    //// Add the efi_error_main_box as page: efi_error_page, Give it nice title
+    content_stack.add_titled(&efi_error_main_box, Some("efi_error_page"), "Welcome");
+
+    kill_me_button.connect_clicked(clone!(@weak window => move |_| window.close()));
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 597bcb3..e6c2079 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,7 @@ mod build_ui;
 use crate::build_ui::build_ui;
 mod save_window_size;
 mod welcome_page;
+mod efi_error_page;
 mod language_page;
 mod eula_page;
 mod timezone_page;
@@ -20,6 +21,7 @@ mod keyboard_page;
 mod partitioning_page;
 use crate::save_window_size::save_window_size;
 use crate::welcome_page::welcome_page;
+use crate::efi_error_page::efi_error_page;
 use crate::language_page::language_page;
 use crate::eula_page::eula_page;
 use crate::timezone_page::timezone_page;
diff --git a/src/style.css b/src/style.css
index 8ba0524..ebda6e8 100644
--- a/src/style.css
+++ b/src/style.css
@@ -3,6 +3,11 @@
     color: red;
 }
 
+.big_error_text {
+    font-size: 32px;
+    color: red;
+}
+
 .header_sized_text {
     font-size: 32px;
 }