1. Rebuild your desktop - (ought to be done quarterly or when icons
look funny)
2. Scan the hard drive with Norton Utils Disk Doctor or other quality utilities package.
3. Check for extension conflicts (startup with just the standard MacOS extensions and your printer driver)
4. Zap the PRAM
5. Check for loose cables, bent pins in the cable itself
6. Check for SCSI setup - everything terminated and plays well with each other?
7. Do a clean install of your system folder. (keep
the old one, you might be able to use it)