You really need to get a real Apple OS-9 CD that came with the system as its setup as a bootable disk, then try your CD drive again. The other direction is to setup a bootable external drive if the original HDD is still working and boots the system (basically, acting as the CD but now we are setting up the external drive as a bootable drive. Then swap-out the HDD for your SATA-I (1.5Gbps) as I’m not sure if a SATA-II (3.0Gbps) SSD will work in this series via a PATA to SATA converter.
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Look through this listing to find the OS install CD that nearest to you [https://www.ebay.com/sch/i.html?|Macintosh OS-9 disks from eBay Marketplace]
You really need to get a real Apple OS-9 CD that came with the system as its setup as a bootable disk, then try your CD drive again. The other direction is to setup a bootable external drive if the original HDD is still working and boots the system (basically, acting as the CD but now we are setting up the external drive as a bootable drive. Then swap-out the HDD for your SATA-I (1.5Gbps) as I’m not sure if a SATA-II (3.0Gbps) SSD will work in this series via a PATA to SATA converter.