Unable to see on Network

Hi, I have been trying for most of the night to get this brand new printer to be recognised on my network.
I have correctly loaded all the IP, Subnet and gateway data, and there is plenty of flashing light activity on the connection at the back of the printer.
I am concerned that the setting I am putting into the printer are being save correctly as there appears no way to get out of the setup menus other than switching off the printer and switching it on again.
I know the printer is not faulty as it worked last week when connected to the network, but since then it has been played with by a variety of people. Is there a factory reset option anywhere to ensure I do not have a rouge setting anywhere which may be causing the problem?
Any assistance would be appreciated.