The Dell / Microsoft tablet or computer is not working properly. What can I do?

Third party hardware Tobii Pro
In case your tablet or computer is not working as expected, please contact Dell or Microsoft support directly using your Dell service tag or your Surface serial number and the links below.
 
For Dell products:
http://www.dell.com/support/home/uk/en/ukbsdt1?lwp=rt
 
For Microsoft products:
https://support.microsoft.com/en-us/help/4023527/surface-how-to-get-service-for-surface