Hi @ricki90 welcome to this free user-to-user Alienware laptop discussion forum.
Please share the Alienware Model and Revision number, example x17 R2. Please share the operating system, example Windows 11 version 22H2. Was system purchased with Dell warranty and is it active? Thank you.
The first time you boot after changing the system from CSM/Legacy to UEFI, you must do so in safe mode so the system can install the correct driver for the storage drive.
Reverse the changes you made -- and the system should then boot.
Then you need to decide whether to try again, or reinstall Windows (if you decide to try again, make sure you have a backup of the system that's been verified -- things do go wrong with a drive mode change).
To receive assistance from Dell Chat support, they need to verify the warranty status and ownership. Then you must troubleshoot with them. Click the "Get help now" icon on the right to start a live private chat session. Provide to them the private Service Tag and all of your troubleshooting.
crimsom
7 Technologist
•
6.1K Posts
0
April 20th, 2023 08:00
Hi @ricki90 welcome to this free user-to-user Alienware laptop discussion forum.
Please share the Alienware Model and Revision number, example x17 R2. Please share the operating system, example Windows 11 version 22H2. Was system purchased with Dell warranty and is it active? Thank you.
ejn63
10 Elder
•
30.7K Posts
0
April 20th, 2023 13:00
The first time you boot after changing the system from CSM/Legacy to UEFI, you must do so in safe mode so the system can install the correct driver for the storage drive.
Reverse the changes you made -- and the system should then boot.
Then you need to decide whether to try again, or reinstall Windows (if you decide to try again, make sure you have a backup of the system that's been verified -- things do go wrong with a drive mode change).
DELL-Chris M
Community Manager
•
56.9K Posts
0
April 22nd, 2023 11:00
To receive assistance from Dell Chat support, they need to verify the warranty status and ownership. Then you must troubleshoot with them. Click the "Get help now" icon on the right to start a live private chat session. Provide to them the private Service Tag and all of your troubleshooting.