A while ago my wife asked me to upgrade the RAM on her PowerPC Mac Mini from 256megs to 1gig because Quark Express was complaining. I thought I would put together a little guide for anyone who would like to do this themselves. It was actually a lot easier than I thought it would be. So lets get started.
Please note: I take no responsibility for any damage you do to your machine as a result of following this article. So if you are a bit squeamish or not confident with machine hacks this probably isn't for you. Remember to read the whole guide through before starting. This is only for a Mac Mini PowerPC and NOT an Intel Mac Mini.
What you will need
- 1 x Paint scraper (that's it!)
Step 1

Unplug all cables from your Mac Mini and turn it over. Using the paint scraper (be careful here) push it in between the gap between the case and the base of the unit (this part is actually the hardest I have found). You may need to use your nail here to eventually "pop" one side up. If you are not careful you may end up scraping the case so take care.
When it does eventually come up you will hear a "popping" sound.
Step 2
After one side comes up turn the Mac Mini around and gently pry up the other sides with the paint scraper.
Step 3
After you have pried up the sides of your Mac Mini it should look like the photo. As you can see the base of the Mac Mini is actually held in place with plastic clips and these are responsible for making the "popping" sound when you first pry up the lid.
Step 4
Separate the base from the lid now that you have pried it free. Put the lid to one side and turn the base unit around so you can see the RAM module on the side.
Step 5
Remove the RAM module by pulling back the clips around the RAM Module (Caution ensure you are earthed before doing this or have touched a radiator or an earthed item first to remove any static from you).
Now insert the new RAM module ensuring the clips are in place. The RAM needs to sit firmly in its slot.
Step 6
Now place the lid back on top of the Mac Mini base unit and push it down until it clicks back into place. You're done!