Help! Perc H710 raid 5 4 disk array 2 online, 2 missing with one showing foreign state.

Hello,

Im hoping someone can help guide me to get this system up.   I have a T420 with a perc h710 that is not starting due to no boot device.  I looked inside the controller to find that 2 drives missing & 2 online.  Looking at physical disk management tabe it show 3 disks -1 foreign and 2 online.  I don know that 1 of the drives has failed becasue it is clicking.  The order of the drives is : 0 - missing (clicking sound) , 1 - missing (foreign config) , 3 - Online , 4 - Online.  At the start of the system it asks if I want to import the foreign configuration and im not sure what to do as there is only 3 drives showing up and 1 is foreign.  I do have another drive to add as a spare, but again not sure what the best thing to do as its not showing as failed.  Unfortunately back ups s of now is not an option. 

Thank you for your time and advice in advance