Hi Ken,
After attempting to clear the suspect flag and then rebooting, which of the messages are you getting during recovery of the database?
If it is "...An earlier attempt at recovery marked it 'suspect'..." it means that you didn't manage to get the suspect flag cleared properly. Please try again and post the exact steps you used if the second try isn't successful.
If it is the 605, then it sounds as if your first allocation page (page 0) may have been overwritten by something else. Are you using file system devices or raw partitions for the devices? It is likely you will have to drop and recreate the database. If using raw partitions, the problem may be due to how the disk is partitioned (overlapping partitions are a possibility) and that would need to be identified and corrected before re-creating the database to prevent the problem from happening again.
-bret