Dell All-in-One hard drive issue?

We had an overnight power outage. In the morning my PC was beeping and stuck on the Dell splash screen. It’s a Dell all-in-one Win10 PC with a SATA 2.5 1TB mechanical drive. When the machine tries to boot it goes into some sort of Dell/Bios test utility that checks hardware/media condition. That ‘test’ result comes up with a ‘hard drive failure’. I booted to a Windows 10 installation DVD and tried to see if it would allow me to perform the ‘repair’ function but it just kept complaining about the hard drive. So I put a new 2.5 drive in the machine and it allowed me to install Windows 10 with no issues. I figured the drive was just bad but….I put the old drive in an sata to usb enclosure and it connects fine to the PC but only shows the old OS as its contents. I can’t see any of my personal data. I used AOMEI to see if there were any hidden partitions but I only see the 1TB disc as a whole. Is my data lost or is it still in there somewhere? If so, how do I get to it?