Basically I ordered a 27" 2013 iMac on Monday from Amazon (which was 1680 as opposed to Apple's price of 1800) and got one day shipping because I have Amazon Prime. So I got the iMac yesterday, hooked it up and turned it on and heard the familiar chime but the LED screen did not turn on, I was quite annoyed. I turned it on and off multiple times with no luck. Finally I hooked it up tio my HDTV and it worked fine with a different display. So I knew the LED was broken or not connected properly. I call up Amazon and because they are so cool (can't blame them for the defect), they ship out another one with one day shipping and refund me my original shipping since I was supposed to get a working iMac within a day. Unfortunately I missed UPS by about 10 minutes today, so I will get it tomorrow. But I want to know that everything is working properly. That's why I am wondering if there is a app that will tell me about every piece of hardware and if it is working properly. Obviously I can test a lot of the stuff myself, but there is plenty of stuff that runs in the background that I can't, like fans and other parts that are just working without much info. I am thinking iStat is going to be useful but I am wondering if there would be an app even more detailed about every piece of hardware inside the mac. Just because I don't want to find out I bought a Mac with something that isn't working properly and miss the exchange period. I am going to be getting a 3 year warranty via SquareTrade for $80 on Amazon (god I love them) so that gives me some comfort.