The HDD is blank, you will need to reinstall Windows, if you didn;t make a copy of the recovery partition on the old HDD, then you will need to ask Dell for recovery DVD.
Personally, I would just use Microsoft Media Creation Tool to dump a copy of the OS install image to USB, install from that, then download and install the Dell drivers, which means no Dell bloatware and leaner Windows install.
The HDD is blank, you will need to reinstall Windows, if you didn;t make a copy of the recovery partition on the old HDD, then you will need to ask Dell for recovery DVD.
Personally, I would just use Microsoft Media Creation Tool to dump a copy of the OS install image to USB, install from that, then download and install the Dell drivers, which means no Dell bloatware and leaner Windows install.