How can I erase my hard drive if the Installer can't find it?

Our iBook, 10.3.9, was pretty reliable for 5 years, but it started to work slower the past days (maybe thru too little free space or too many programs open at the same time), so we restarted a lot.. until it didn't restart but came up with the question mark; then with a black screen/white letters asking for a login. But what is my login? I only know my admin password.
I ran DiskUtility and repaired the permissions and wanted to repair the disk as well, but it said (in red letters): unable, could not unmount disk.
I tried Archive and Install, but it stopped halfway and said there was an error, try again later. I didn't try again, but managed to save most of my documents to another iBook (10.4.3) thru FireWire Target mode.
Then I was ready for Erase & Install.
When I first got this iBook, I had a big accident and had to erase and install, at which time an Apple tech person advised me to first install 10.1 and then 10.2 ('cause this iBook was first made with 10.1, it had 10.2 when I bought it). So this morning I put my 10.1 install CD in and selected Disk Utility to Erase the hard drive. This was recommended in another thread to erase all faulty blocks on a computer. I must say the hard drive itself (below the '27 GB OSX' thing with the triangle in front of it) was already greyed out, but I selected this triangle thing and said erase.
Then I went back into the Installer but... it can't find any hard drive to install OSX on. It shows just one blank space...
The strangest thing is that one time this morning when I opened the iBook, it started up just like normal! But it worked too slow, it wasn't fine, so I restarted and then the problems came back just the same. Now I'm back atthe black screen with white letters. It makes me think though that not all is lost with this computer, which my family hopes with me.
What can I do???
ibook Mac OS X (10.3.7)

Cornelius,
ask as many questions as necessary! I know it is a confusing situation.
Your profile lists OS X 10.3.7.
I believe I upgraded last year to 10.3.9.
Do you have a Full Retail Version of Panther available for re-install?
Yes.
What OS version(s) do you have a full retail version for?
For 10.1, 10.2 and 10.3.2.
Do you have an OS currently installed on your computer?
I don't know...
This morning I had set my mind to do the Erase & Install. I inserted the 10.1 disk, opened DUtility and selected "Erase" from the tablist. At that point the hard drive under the top-triangle was already grey I believe. I selected the top line, or the grey line, am not sure which was last. The computer started to spin. I can't tell if it erased anything at that point. But I know that once the computer stopped spinning its operationwheel, I quit DU and went on trying to install, but then there was no installation disc available. There was just a blanc field.
There was nothing else to do but restart, and at that point the computer opened up with a desktop like normal. I know it sounds crazy.
But it didn't work well. I could open a jpg-file in "Preview", but went in "Mail" and it took forever to open a message, at which point I restarted.
And since then, the normal desktop hasn't shown up anymore.
Whenever I restart, I keep getting stuck at 1. a flashing icon with the picture of a globe, which changes into
2. the question-mark, then
3. the window "Mac OS" with the blue stripe, filling up almost all the way and then
3. a black screen with white letters. If I type something and press return, it asks for password. If I type anything and press return, it says 'login incorrect', and then I see a new screen with "Darwin/BSD (X-3.local) (console)..... next line: "login: "
I don't know what my login could be.
I have since started up from the 10.3 CD, but also only saw a blank field where there should be an icon of my hard drive. (at 'select destination').
Since my post, I used my Apple Hardware Test-CD, and that gave a pass. It said "No device found" for AirPort and Mass Storage. "Device found" for Modem and "Passed" for Logic Board, Memory and VideoRAM.
In any case, what I want to do is still to Erase & Install, because something seems to be very wrong and my stuff is safely backed up.
Looking forward to your answer. Thanks a lot.
ibook Mac OS X (10.3.7)

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