I read up on how to do it, but it made it look so easy. I had no problem opening up the iMac to get to the user installable ram. I can't make it fit in the slot. I ordered it from crucial and am 100% positive it is the correct ram, I even read the small print on the ram module to check. There is this stupid plastic sheet that I at first thought I had to remove, but left it guessing it is to protect the chips below from the user installable airport card and Ram. I already have spent an hour going through google and kept getting the same sites that I had been to. Crucial wasn't kind enough to even give directions for the imac ram installation, they gave me a standard PC type of directions in the box. The pictures suck in them too. I must say I am not impressed with crucial. They have no guides on their website for the imac g4. It should be so simple, but it's not. HELP me please. Give me a link to an actual good website and not this one: http://www.xlr8yourmac.com/systems/iMac_g4/imacg4_takeapart.html any help would be great, for now I am stuck on this 400 mhz g3 imac.