HANA Appliance Initialization

Hi Experts,

I  have one Dell 840 Hana appliance Delivered at customer site , Customer has assigned the IP address and Appliance is accessible working ok. This is new appliance.

Generally, the Flow is  we power on  the appliance first , it asks for few details e.g., IP address, DNS, HANA SID ,SYSTEM Password  and all set and go . HANA initialize and than we can config the rest. 

. In current  scenario the first phase is done without setting the initial  config parameter for Hana.

Could you please suggest on how to launch Gui again to initialize the HANA in the appliance?

Thanks In Advance