Longshadow wrote:
You didn't say HOW or what you did to install the drive...
They cannot just be "swapped".
Just in case - If you didn't copy the operating system and data to the new drive, there is nothing on the new drive, they come empty.
When the computer tries to boot, there is nothing on the drive for it to use, so the computer cannot boot.
I didn't replace the C: drive with the OS, I replaced the D: drive used for data storage. That data is backed-up on an external hard drive.