Hello. I've heard that there is a cheaper way to upgrade the RAMs on the iMac. The memory is a Kingston brand or something similar if existent. To buy it from apple (4GB) it's about 850$, the Kingston suppose to be much more cheaper. It's important to me that the installation (hardware&software as well) will be not so complicated, I'm a regular user, not a robot that knows only to open safari but also not a geek, or in other words, that I'll not have to come & cry on the forum Last thing, that thing keep the warranty in validity ? ThanX a lot. p.s.:sorry for any spelling mistakes.