Apple MC309LL/A 21.5" iMac 2.5GHz 4GB 500GB Big, beautiful displays. 21.5- and 27-inch displays. Today's iMac has come a long way from the first 15-inch iMac. Take one look and you'll see just how far. A 21.5- or 27-inch display with edge-to-edge glass covers nearly the entire front of the enclosure. When all you see is the display, nothing gets between you and what's onscreen. Movies, TV shows, FaceTime HD video calls, websites, photos everything looks stunning on the widescreen 16:9 iMac display. LED backlighting. The more pixels a display has, the more light those pixels need to achieve the best picture possible. And that's exactly what the LED backlighting in iMac does: It pushes light through each pixel with remarkable brightness and efficiency. Because the LED backlight doesn't take up much space, the iMac enclosure stays thin even with all the high-performance components inside. High resolution. The 21.5-inch iMac features 1920-by-1080 HD resolution. Apple engineers could s
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