My situation: I did run into ab massive windows boot thirty minute “please wait” issue. After hours and hours i did track this down to an issue with an re-appearing deleted network printer.
This printer was installed on these machines and replaced by a new network printer. The old printer was deleted with a gpo an client machines. All works fine until the old network printer was shut down. From this moment all windows clients stalled in the “please wait” for thirty minutes.
I did try to delete this printer manually from a test client. it re-appeared after reboot.
I did disconnect this client from the DC and did delete the printer again: it re-appeared again after reboot.
Further analysis result. This printer was forged into the registry:
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Providers\Client Side Rendering Print Provider\Servers\THISOLDBASTARDPRINTER
After i did delete this registry key the prrinter the printer did not show up again and the boot problem was solved.