Internal and External USB Drive access has failed!

Hello Troubleshooters,
I am a new forum member. The following is a post I sent out last month but no one has as yet solved my problem.
Could you try for me please?
Thanks, Major Mac.
SOS... Please help me solve this problem that occurred suddenly.
I can no longer see any CD or DVD on my Desktop when I load the Drive... no access.
Neither can I see any Printer, Flash Drive, or any external Drive whether plugged into a USB or Ethernet Port. Only my Canon Camera loads onto the iPhoto Application via USB, and my Internet link via Ethernet.
Is a Driver damaged or missing? Does this have anything to do with BIOS or Firmware? Just guessing.

I apologise for the late reply guys. My service provider was experiencing some tech difficulties and I had no connection for most of today.
Thanks to Roam, Cornelius, BDAqua, Kappy and K. Shaffer. Your Tech info and suggestions tremendously increases my learning curve.... I notice, even among each other (;
Now that I have Internet access restored, I will attempt your suggestions, starting by attempting a "Safe Mode Boot", then Apple Jack.
Concerning your personal preference for Tech Tool Pro, DriveGenius or Disk Warrior (in that order) I became supprised because I read from either BDAqua, Littleshoulders, or someone else, who suggested those Tools in the opposite order of preference, and also submitted links to testimonials which highly rate Disk Warrior as the best and their life saver (after God). I was really impressed with Disk Warrior, that's why I have decided to find the money to purchase it.
But because I'm studying and not earning income, I am attempting everything everything possible that has little or no cost to execute a fix.
So if I get no positive results from "Safe Mode Boot", or Apple Jack, then I will attempt the procedures stated in your link for "Kappy on Error -9972".
I tell you Cornelius... this mouthful of troubleshooting info from Kappy is one to be recorded and used for greater learning.
If I had this info a year ago, most likely I would not have lost my data on my original HDD that came with my G4. Yes.. I am experiencing problems with a new HDD that a Technician installed in my G4 only a year ago. Yes... its a Seagate Barracuda 7200-10 160Gb. Now tell me that this brand is no good so that I would feel comfortable with my Technician. Good thing is that he gave me back my original Hitachi Deskstar 7200 120Gb which I felt I might be able to salvage in the future.But having no time to pursue it because of my studies. Now.. push has come to shove!
What I need you guys to know is that I had similar trouble reports from Apple Disk Utility about the original HDD which got worse until the HDD refused to boot. But this time around, the replacement HDD boots and runs pretty good, even with one 512Mb memory card installed. It's just that I no longer have access to the Super Drive, or any external drive via USB or Ethernet. Tomorrow I'm going to hook up an external drive via my Firewire port and hope to see it on my desktop screen.
Thanks to K. Shaffer for the link to Smart-Utility. I will read up on that tonight and see what help I can access also.
Again thanks for the prompt replies. I will be monitoring the forum tonight to look for your replies, and will update you all later tonight as well.
BTW How do you all receive all these posts on the fly? Is it that you're logged in 24/7 ?? Or are you subscribed to everyone on board? (;

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