How to format the hard drive without upgrading.
Any ideas..
The blunt answer here is yes... reinstall the same software load manually (FTP method), and there is a flag to re-partition the drive, this will cause a format action to occur and reinstall the same software load.
Typically though, if there is a database issue like you state, the first method of correcting the issue is to perform a backup and restore from the the administrative web portal. During the restoration process, any invalid or corrupt data is ignored and you can watch the output of the serial port or telnet 2002 session to see what is failing, note that the database isn't REALLY restored until the next reboot, so you have to monitor it through the entire process.