A critically important database with no backups that's suspect. Usually I'd say URLT, but not applicable in this case unfortunately.

What you did could not cause the suspect status. Recovery pending maybe, but not suspect. Suspect means that the database engine encountered some form of corruption while doing crash recovery.

What is the current situation?

If there's still a suspect DB...

Query sys.databases and post exactly what the state_desc for the database is

Open the SQL error log and find any and all messages relating to this database.

The error on checkDB is, as ALZDBA said, due to the quotes. There's a ` where there should be '

That said, you can't run checkDB on a suspect database. Hence the request for the database state and error log.