Windows 8.x has a new feature called Fast Startup (hybrid boot or hybrid Shutdown) to help your PC Boot faster after shutting down by using a hybrid shutdown which is a partial hibernate, making it impossible for users who are Dual-Booting with Linux or Unix OS to see the GRUB menu. Windows 8.x uses saved system information to resume your PC instead of having to do a cold boot to fully restart.
1. Open the Control Panel , and click on the Power Options icon. 2. Click on Choose what the power buttons do link on the left pane.
3. Click on Change settings that are currently unavailable link at the top.
4. If prompted by UAC, then click on Yes button.
5. Under Shutdown settings, uncheck the Turn on fast startup box, and click Save changes button.
6. The Power option will now perform a hybrid shut down.
NOTE: If the Turn on fast startup settings is not listed, then we can disable it from the Registry Editor
1. Press the Windows+R to open the Run window.
2. Here enter regedit and press the Enter key.
3. Navigate to:
4. Change the Value Data to zero
0 = Turn off Fast Startup
1 = Turn on Fast Startup