Mac computer cannot recognize Snow Leopard Install CD


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I am trying to reinstall Snow Leopard and I am putting the Snow Leopard CD using a Samsung External DVD Drive. The Snow Leopard Install CD boots up on every Mac except THIS ONE MAC. So I tried to boot the CD by restarting the computer and holding Option. Then I tried it by restarting and holding C. Then by restarting and holding Command. Then I tried holding Shift + Option + Command + Del. None of them worked; the DVD Drive is not listed as a boot up option ever.

I also tried going into system preferences and looking in startup disks but the external cd drive is not listed as an option.
When this Mac reads the snow leopoard CD from the drive, the CD is labelled "TSITFAT" and I get random exe files that cannot be read in Dos Mode. But when I use the Samsung external drive and put it on any other Mac, the Snow Leopard CD works perfectly.

Anybody know what I am doing wrong?
Here is the Hardware Overview:
Model: Power Mac G5 Model Identifier: PowerMac 7.3 Processor Name: PowerPC G5 (3.0) Processor Speed: 2 GHz Number of CPUs: 2 L2 Cache (Per CPU) 512 KB Memory: 4 GB Bus Speed: 1 GHz Boot Rom Version: 5.2.4f1


Thanks for any advice


I also have a bunch of ancillary problems. For one, when I go into System Preferences and click Network, System Preferences will freeze. Mac Airport also doesn't work in finding the Router (Airport Extreme), but for some reason it will recognize my iPhone when I use it as a wifi hotspot in PDAnet.
 
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Snow Leopard doesn't run of PowerPC, that'll be your problem.
 

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