Hi again
Your system memory usage looks okay. You do have a fair amount of disk activity, which is the likelier source of your startup slowdowns.
Since you did a reset, Windows is going to have to catch-up for the next few days (as long as a week) with all the updates that now need to be installed. The black screen at start - especially if you see high disk activity (hopefully your Lenovo has a disk activity indicator light) might actually simply be Windows updates working on files coming and going - and once the files are where they have to be, there are often a fair amount of settings & Registry entries to take care of.
You can speed up the process by manually visiting Windows Update, and if nothing is currently waiting to install - click "Check for updates" & then click "Install now" when they are ready (or let Windows install them overnight - usually the default is around 3 a.m.)
You can also visit Windows Update & click "View update history" ... to see if any updates are failing, and trying to install over & over. If so, let us know & we can help with that (you'll likely need to visit the Microsoft Update Catalog site & download the standalone installers).
