You may find the Leopard OS X 10.5(.8) system either won't install
in that model G4 iMac 17-inch 800MHz due to limitations on CPU
or if it already has been tricked into running it, that is rather slower
than if it had been compared to supported Tiger 10.4.11.
The wireless card early model (if included) does not support WPA2
later version Wi-Fi security protocol; works best with similar vintage
AirPort base station. Or much better/faster with Ethernet cable.
The clock battery would need to be replaced. This is a chore.
Otherwise the system may not want to boot or run correctly.
• NewerTech 3.6v Lithium 1/2 AA PRAM Computer Clock Battery
The browser (if Mac is given all the RAM upgrade it can use, both
RAM slots) available would be TenFourFox. ~ There presently is a
rendering issue in TenFourFox present build, so Apple sites could
be seen correctly; use the 'about:config' in browser to reset gfx so
fonts in Apple Support/Apple.com page won't render odd icons...
Until the makers of TenFourFox release an updated step, workaround
for Apple site font renderings is to temporarily set the item in 'about:
config' (you can use in-browser search from about:config window) by
double-clicking on the item to make it change so it no longer says True.
" gfx.downloadable_fonts.enabled = false " so as to be able to read
most Apple site pages. The newer fonts and layout of Apple pages
show incorrect or iconic [X] instead of letters. I use a G4 Mac Mini with
Leopard 10.5.8 w/ TenFourFox 45.7.0 version. I know about this issue.
http://www.floodgap.com/software/tenfourfox/
About the SSD upgrade. You could see a good increase in read-writes
to the hard drive including Virtual Memory swap files where the RAM is
inadequate for certain data, so the system would use drive space then.
OWC macsales.com find upgrade parts for many models: MY UPGRADES
https://eshop.macsales.com/upgrades/imac-g4-17-inch-mid-2002-0.8-ghz
Various parts include the "OWC Mercury Legacy SSD" for ATA computers.
And that clock PRAM battery. ~ Also fairly good 'take-apart sites' are online
which show disassembly of iMac G4 to replace battery, upgrade RAM, etc.
Sources online may yield a viewable copy of original Apple Service guide
that show complete factory technical details; somewhere I have a copy.
An example of the internal view of G4 iMac (believe this is later 1.25GHz) shown
Mr Totes iMac G4 take-apart, here: http://www.mrtotes.co.uk/page1/page1.html
Note this is not technically the same as similar appearing iMac G4 800/17-inch.
On the other hand, there's more info on take-apart for Drives, RAM, & battery:
http://www.xlr8yourmac.com/systems/imac_g4/imacg4_takeapart.html
Not sure if the iFixit guides for Macs have specific one for the 800MHz 17-inch
model. I had one that could dual boot MacOS 9.2.2 & later Mac OS X 10.4.11.
There is an open firmware update method to trick these to accept 10.5 installer.
Anyway, the unit with original box and hopefully some paperwork, should be
worth something to a collector. Documentation of its early life is helpful, then.
Good luck & happy trails! 🙂