Hi there @ IzidorS,
Welcome to the HP Support Forums! It is a great place to find the help you need, from other users, HP experts and other support personnel.
I understand from your post that you have an issue with your HP ProOne 400 G2 20-inch Touch All-in-One PC and promethean activboard.
I would recommend you contact our HP commercial Support by clicking on the below link:
www.hp.com/contacthp
(1) Once the support page opens please select the country in which you're located. Next, enter your HP model number on the right.
(2) Next, choose the 'Contact Support' tab at the top and scroll down to the bottom of the 'HP Support- Contact' page to fill out the form provided with your contact information.
(3) Once completed click the 'Show Options' icon on the bottom right.
(4) Lastly, scroll down to the bottom of the page and select 'Get phone number.' A case number and phone number will now populate for you.
Please keep me posted.
Regards,
