Problem is with all the db except(master,model,tempdb) but still I can not see the properties of (master,model,tempdb) from Object explorer.
I checked the status of all db in sysdatabases and all of them are online.
Hence, I can not rename file names.
They do not have latest backup of db as well.
I tried on trick and that worked but I believe thats not the proper solutions.
-I just deattached db one by one & attached again and that worked fine.