Want to open your Laptop in Advanced Boot Menu {"Safe Mood, Safe Mood with Networking, Last Known Good Configuration, etc "}
{This Method Also Works While You Can't Access Advanced Boot Menu With "Fn" Key}
{100% Working Method}
1. Open "Command Prompt" as "Administrator Mode" [to know how to open command prompt as admin mode in Windows 8 visit here ]
2. Write the following Command to Show the Advanced Boot Menu and press "Enter"
bcdedit /set {bootmgr} displaybootmenu yes
3. After Successfully Completed the Task You Can See the Massage.
4. Type "Exit" and "RESTART" your Laptop to See the Change.
5. To "DISABLE" Advanced Boot Menu then Write the Following Command and press "Enter"
bcdedit /set {bootmgr} displaybootmenu no
6. Now Press "EXIT" and restart your Laptop.
Thank You !!