So.... I sm new to the Mac world. Yes new. Have had several apple products, but this is my first Mac. I do not know how I have not had one all these years! So I have a late 2011 MacBook Pro 15 not I just took out of it's package on Wednesday. It has 4 gigs or Ram, and Apple is saying I can updrade to 8. Can I not go to 16 on this setup? Also, is the ram that people are selling on eBay any different then what I can buy at apple and will installing the ram myself void any warranties? 2nd issue, while trying to watch online videos, I get a "video not available" error a lot, or my MacBook wants to download the video before watching and the video is in a format not recognized to play. Sorry for the LONG message and if it is in the wrong area. I am new hre as well!