|We have no idea of many of the needed facts here.|
One is the state of the original system.
Two is how this new PSU actually works. You can't just guess. Many PSU's are rated in very different ways. Some are controlled both voltage and current. While others use the load to regulate
Third is the ac component of the psu.
If the old drive suffered some sort of catastrophic power issue it could have damaged any part.
If this deal were to work, it should show up in Admin tools, part of storage management mmc.
Text, talk, drive...CRASH.
Hang up and drive @#$%^^