I've got a curious little problem going on over here. I've got an old late 2006 iMac (the white one). Was sportin' 1gb of ram, so I went and bought some more (4gb). Actually I bought two of those, and installed 4gb into another iMac no problem.
Installed them into the white iMac and it wouldn't boot. Has a funny little mechanical sound that revs up, clicks, fails and then tries again over and over.
- Reinserted the original 2 512mb sticks, works
- Inserted one new stick in the top rack, works
- Inserted same new stick in bottom rack, works
- Inserted the second new stick in bottom rack, works
And then a few more intermittent attempts with both new 2gb sticks installed... no boot.
What the what?
EDIT Found it. Turns out it's an early 2006 iMac which only supports 2gb.