Dual boot OSX and 9.2, how to switch back to OSX?

Hi Guys,
I am brand new to Mac. I was given this iMac Power Mac 750 600Mhz with 256MB memory and a 80G hard drive. When I got it, it boots to OS X and I don't know what I did (maybe because I plugged in a USB hard drive) but it started to boot to OS 9.2 now, and I don't know how to switch back to OS X.
I remember, when I plugged in the USB flash key, it was running OS X, and it asked me to hold on the power button for several seconds to reboot, I followed that, and it boots to 9.2 ever since.
How do I make it boot to OSX?
Thanks!

Hi Hexar,
First of all, Welcome to the  Discussion forums and to Mac computers!
See: "Mac OS 9, Mac OS X: Press X key during startup to select Mac OS X on single-volume installations"
post back if you have further questions or comments,
LS

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