Computer Does not Start After Installing a Video Card (Windows 8)
This document applies to HP desktop computers that shipped with Windows 8 installed.
HP computers that come with Windows 8 installed use an AMI BIOS version 8 that is compatible with UEFI (Unified Extensible Firmware Interface). This version of the BIOS includes and automatically enables Secure Boot, which can prevent your computer from starting after you install a video card other than the card that shipped with the computer.
How Secure Boot works
Secure Boot Configuration is a new feature in BIOS 8 that allows your computer to validate the authenticity of components like hardware and firmware. When your computer was manufactured, UEFI created a list of keys that identify trusted hardware, firmware, and OS loader code. It also created a list of keys to identify known malware. When Secure Boot is enabled, the computer checks that everything being loaded and used even before Windows opens is safe and recognized. Secure Boot also checks the validity of critical hardware, including the motherboard and video card. Any malware or other firmware code that is not recognized is blocked. For example, Secure Boot can prevent your computer from starting from illegally copied CDs or DVDs that could harm the computer. Secure Boot does not lock out valid recovery discs or Windows discs.
If an older model video card is installed in the computer, Secure Boot might not recognize it as valid hardware. If the card is not recognized, Windows does not use the card when it boots up, and you may experience problems starting the computer, or there might be no video output at all.
To resolve the issue, you can use a video card that Secure Boot recognizes, or you can disable Secure Boot and enable Legacy Boot in the BIOS. This document explains how to disable Secure Boot and enable Legacy Boot.
Restore the computer to its original configuration
If your computer came with on-board video only and you installed a new video card, remove the video card.
If your computer came with a video card installed and you replaced the original card with a new card, remove the new card. Replace the original card in the computer.
Disable Secure Boot and enable Legacy Boot
Follow these steps to disable Secure Boot in the BIOS.
- Use one of the following methods to open the Computer Setup Utility.
To navigate the menus, choose menu screens by pressing the left or right arrow keys. Use the up or down arrow keys to move through the list of items on the menu screen. Press the Enter key to select an item and open a submenu. Then use the left and right arrow keys to modify the settings. Press the F10 key to save the changes and exit from a submenu, or press the Esc key to exit from a submenu without saving the changes.
- Turn on the computer and immediately press the F10 key repeatedly, about once every second, until the Computer Setup Utility opens.
- Turn on the computer and immediately press the Escape key repeatedly, about once every second, until the Startup menu opens. Then press F10.
- Use the right arrow key to choose the Security menu, use the down arrow key to select Secure Boot Configuration, then press Enter.
- Before you can use this menu, a warning appears. Press F10 to continue to the Secure Boot Configuration menu.The Secure Boot Configuration menu opens.
- Use the down arrow key to select Secure Boot, then use the right arrow key to modify the setting to Disable.
- Use the down arrow key to select Legacy Support, then use the right arrow key to modify the setting to Enable.
- Press F10 to accept the changes.
- Use the left arrow key to select the File menu, use the down arrow key to select Save Changes and Exit, then press Enter to select Yes.
- The Computer Setup Utility closes and the computer restarts. As soon as the computer starts, a message appears indicating that the boot mode has changed.
- Type the four-digit code shown in the message, then press Enter to confirm the change.NOTE:No text field displays for the code. This is expected behavior. When you type the numbers, the code is logged even without a text field.The computer starts Windows 8.
Install the new video card
Install the desired video card in the computer. Make sure the card is compatible with the computer and meets the specifications for your PC.