I received this computer in the mail and am typing on it right now and have a few concerns. 1. Some keyboard keys are stiffer than others. Is this normal and do the stiffer keys become less stiff over time? 2. I think the screen is slightly yellowish but have not done any tests yet so will get back on this. 3. I tried to watch youtube and they asked me to install Flash. I did but Safari still asks for Flash. Vimeo works but I can't full screen. It is strange how small things like this that should work have problems on a Mac. This is the first mac I have personally owned although I have used iMacs at work. Please advise.