So you have Bios2 like my unit. Pull the drive and get an ide to usb, after that plug it into your computer and run check disk fix on it. After that it will install about 3 more files to the drive. once you boot it your bios will do an authentication check, find those files and remove their traces.
When you see the MSVerify message for me that is when it goes to boot the program, verify its integrity ie the "igt os" just embedded XP... and if the hard drive is reading off bad sectors it will throw bad codes... the check disk will do alot of help, as mine was not letting me boot from the drive to begin with. I wouldnt want to keep playing a machine in safe mode, not for the longevity. If anything let me walk you through how to safely make a copy of your current drive, transfer it to a new drive, and repair it, so at least if anything does happen with the machine, you will at least have your game!
Sam