Where Can I Find How to Change RAM in a 2005 iMac, 1.8 GHz PPC G5

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Here's but one of many videos you can find on the web for installing RAM for your year and model iMac.

http://eshop.macsales.com/installvideos/imac_g5_mem_h/

Given that there are three different models of 1.8 GHz PPC G5's using PC3200 DDR 400MHz 184 Pin RAM (Size - 17"/20"; Year - 2004/2005; Model No. - A1058, A1076; Model ID - PowerMac8,1, PowerMac8,2; Order No. - M9843LL/A, M9250LL/A, M9249LL/A; EMC No.- 1989, 2008, 2055), you usually need to provide more information.

Info on how to find/gather this information:

https://www.ifixit.com/info/ID-your-Mac

http://www.everymac.com/mac-identification/index-how-to-identify-my-mac.html

The three models:

http://www.everymac.com/systems/apple/imac/specs/imac_g5_1.8_17.html

http://www.everymac.com/systems/apple/imac/specs/imac_g5_1.8_20.html

http://www.everymac.com/systems/apple/imac/specs/imac_g5_1.8_17_als.html

That all being said, here are two guides from iFixit:

https://www.ifixit.com/Guide/iMac+G5+20-Inch+Model+A1076+RAM+Replacement/872

https://www.ifixit.com/Guide/iMac+G5+17-Inch+Model+A1058+RAM+Replacement/965

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