I purchased an iMac G3 on ebay. It only had a 13 GB hard drive so I bought a 40 GB internal drive. I installed the new hard drive and went to install Mac OS X Tiger (10.4) on it and I got a note that said "In order to upgrade to Mac OS X v10.4, you must have Mac OS X v10.3 or later already installed on your computer". I don't know what to do because I do not have 10.3 install discs or anything. Can I please have help?