Installing RAMin iMac is easy
5 - 10 minutos
The 20" iMac only had 1 GB of RAM - Not enough to run Lion
It almost took longer to open the box than install the memory. It's really easy to do.
Make sure the RAM is seated tightly. When I first pushed it in it seemed to be in, but it took just slightly more pressure to feel it slide into the contacts. Make sure you push from both ends so it doesn't get cocked.