How do I install a solid state drive to my iMac G5 20" A1076...

You have some limits you'll need to work within:

• This system only has a SATA I (1.5 Gb/s) interface so what ever drive you put in needs to work at this speed. Review the drives spec sheet before buying it to make sure it supports this speed.
• The newest OS this system can support is 10.5.8 Leopard. Nothing newer!
• The Max amount of RAM this system supports is only 2 GB. I strongly recommend you max it out.

I would not recommend using this system on the internet as Apple has no since stopped supporting the OS with any security patches or updates.

You also have limits with the apps and what they can support. You won't be able to use any of todays apps as they require newer OS's to work. You'll need to locate older apps at the flea markets (on CD's).

Here's the IFIXIT guide to replace the internal HD: iMac G5 20" Model A1076 Hard Drive Replacement. You'll want a SSD that offer SATA auto sense technology. As an example: Samsung SSD 750 EVO. You'll need an adapter frame like this one: OWC 2.5" to 3.5" Drive Adapter Bracket. You'll need to save the thermal sensor and re-attach it to the SSD body.

Without a working bootable drive you'll need to locate a retail copy of Leopard (CD) so you can boot up the system to then install the OS from it onto the SSD.