WD External (old) WD3200l032 My Book Green Ring

Drive fails to operate on Windows 7 Ultimate.

Some times fires up but if it does system then hangs and will not re-boot unless drive is disconected.

Welcome to the Community.

It is possible for the drivers not to function properly since they are not certified for Microsoft Windows 7. I would also recommend running a hard drive test to confirm if the issue relates to the drive’s overall health status.