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I'm trying to figure out how to connect and use my PC laptop having VGA video output (female) to iMac 27 (2010). Found some articles about connecting PCs having miniDisplay port but it's not my case. Is it possible at all?

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You can with hardware, but it's not going to be cheap. The main issue is going from analog (VGA) to digital; it's much easier to convert one digital format to another. One (clunky) solution would be to chain a VGA to DVI scaler ($330) to a DVI to Mini DisplayPort converter ($150). If you get similar products on eBay, you can get a complete solution for a little under $250.

A better solution would be with software like ScreenRecycler or one of the recommended alternatives. This way, you're effectively remotely viewing your screen - with a fast enough computer, this works well.

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This is not possible, you can only use the iMac 27" in target display mode with mini display port.

see this kb:

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