Imac 27 as an external screen for PC with VGA

Can I use the Imac 27 as an external screen for my PC? Then PC has VGA output. Will a VGA to MiniDisplay work?

No. The input needs to be either from a Mini DisplayPort or regular DisplayPort. There are a few expensive conversion devices that go from DVI to Mini DisplayPort. However, I do not know of any that convert from VGA, which is an analog format.
The other problem, even from DVI, is the high resolution of the 27-inch iMac display. The 27-inch display is 2560x1440. That is above the regular (single-link) DVI max resolution of 1920x1200 and also above any VGA resolution. So unless the output is Mini DisplayPort or DisplayPort (or dual-link DVI), it can't even reach the resolution needed to use the 27-inch iMac display.

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