Can I restore a previous system? Need 10.4 back running

Please help me in my conundrum.
I have been running 10.4 on my iMac and someone (accidentally) installed 10.2 on it (explanation below). Is there any way I can bring 10.4 back since my Mac Repair Shop had installed it for me. My Mac is old and it may be one of those that needs an internal DVD which I don't have. I have an external DVD connected with firewire but when I put the Tiger disc in it will show, but after restart it won't restart (eternal startup wheel), much less start the install process.
Will I have to go back to my repair guy to reinstall 10.4 for me, or what can I do?
If you want to read on: I was poised to change my startup disk with the 10.2 disk so I could repair my hard drive. Someone else made a few wrong clicks in my absence, wanting to help.
Thanks for any advice you can give me.

Had to get away from it for a little while...very frustrated!
Not it's not a black OS. It has 3Y073212008 on the upper left over the UPC, then on the right 10433-01, lower left 2Z607-3120-A. The disk itself says Mac OS version 10.5.2, AHT version 3A140, Disc version 1.1, 2Z691-6208-A. It was part of a hardware bundle
Sadly, it does not say 10.4 anymore. 10.2 has taken over, by the time I was told what was going on, the second install disk was already running. Nevertheless, the build # is 6C115. Additionally, this is all I can get for the hardware info:
Machine Speed: 700 MHz
Bus Speed: 100 MHz
Number of Processors: 1
L2 Cache Size: 256K
Machine Model: iMac (version = 33.11)
Boot ROM info: 4.1.9f1
(told you, it's an oldie)
Interestingly enough, it does not recognize anything in the firewire port, but it shows me "PIONEER DVD-RW DVR-117D 1.07] Mass Storage Device" on my USB Hub. Hmmm, why would the external DVD be connected both ways? And I checked the wires, it really is connected both ways. Wouldn't it be great if there is just something screwed up in the connection of the ext. DVD to the iMac? I know that if I could just update to 10.5 I'd be in the clear. What do you think?
May not get to see your answer until tomorrow morning. A thousand thanks for taking up this messy fluke with me.

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Can I restore a previous system? Need 10.4 back running

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