Original iMac will not boot from new disk

Question

I am having considerable difficulty getting a new disk to boot in an original 'Bondi blue' iMac.
I think I have researched this issue reasonably well and found a few references to it but no solution. I have more resources than most and have tried every trick I know. The story at the following link is not dissimilar to my experience:
http://www.applefritter.com/node/20518
Details:
iMac - original 233 MHz revision A with 160 MB RAM
New disk - 120 GB 7200 rpm Western Digital disk type WD1200SB
Format - HFS+ with 7 GB first partition and 107 GB second partition
Jumpers - both CD and disk set to master - normal for this iMac I believe
The iMac will seldom boot from OS X 10.3 on first partition or OS 9.2.2 on second partition with or without the other OS totally removed. I have reformatted several times and played with several disk drivers. I have zapped PRAM a few times. I sometimes get a grey screen but more frequently get a flashing question mark.
I can mount both volumes when booted from a CD and every test shows that they behave as expected. The disk boots properly in a G4.
I am prepared to try anything but I would particularly appreciate advice from somebody who knows what the problem is.

Answer 1

Eureka - it works - thanks very much.
It now boots from OS 9.2.2 on both partitions every time. I have yet to replaced the OS X that I removed earlier but I am not expecting difficulties.
My view is that http://docs.info.apple.com/article.html?artnum=25249 is badly written. I assume that item 4 should read 'OS X' and not "Mac OS". It may have been written on the assumption that users only want OS X and Classic on a single partition. My experience, particularly with early iMacs, is that it pays to have 2 bootable partitions and it is expedient to have OS X on one and OS 9.2.2 on the other with the OS 9.2.2 being used for Classic and for direct booting into OS 9.2.2.
My error was in paying insufficient attention to
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?p_faqid=1277&pcreated=1095792241#jumper
which clearly indicates jumper positions for single drives although a few words about it would underline the point. I had already discovered that these iMacs normally have both CD and disk set to master so should have realised that strictly they are 'single drives'. I had initially used the clear, but misleading, drive silk screen printing, ie CS, slave, master to set the jumper but should have changed it when checking the WD site later. Perhaps they could use this thread to update their FAQs - I will mention it to them.
In answer to those, on this thread and elsewhere, who were not happy with my sloppy copying of OS 9.x, I discovered some years ago that as long as you 'blessed' the end result in situ with one of the free OS 9.x updaters it is surprising what you can get away with. - I am not advising anybody to do this unless it is within the terms of their Apple license!
Now I wonder if I should stick with OS X 10.3 or if it is worth trying OS X 10.4 with
http://eshop.macsales.com/OSXCenter/XPostFacto/Framework.cfm?page=XPostFacto.htm l
Does anybody know how satisfactory it is and if it has serious memory or speed implications? My only slightly unusual software is Cisco VPN client.