If you have 3.1 Roms (I dont know about 3.0) you'll have to wait a long time. I don't recall how long but annoyingly long. After that, when the system decided there is no harddrive, the clicking of the diskdrive and the appearance of the usual insert disk screen appears.
The commodore designers put in this huge boot delay to give harddisks time to spin up. My initial thought was there was something wrong too.
Hope this is the case for you to or we have another problematic A1200 here.