Hi all, I've had my White Macbook for the best part of about a year now, and I'm really pleased with it. Recently though it's been getting a little sluggish, I checked the specs out and I have 1GB of RAM on board, I though fair play, and got a 4GB Kit. I've just plugged it in and it's only displaying 2GB on board. I could understand if it maxed at 3 as I am only running a 32bit OS and it wouldn't be able to index the extra gig. I'm now looking closer at the RAM Modules and its saying that they are 1GB each. It seems as if one of my DIMM Slots isn't working, any ideas what I can do or is it back to the Apple store for a hefty repair bill?