566976, RE: Computer won't boot with second HDD attached|
Posted by KJT, Wed Jul-07-21 09:47 PM
Maybe try disconnecting the new drive and plugging in the old drive in its place. If it should boot, you can copy the things you want to keep onto a thumb drive, or other media.
Once saved, shut down and disconnect the old hard drive, reconnect the new drive, and reboot and then copy the thumb drive.