HT3924 Using iMac as external display for PC.  Question re: Cables

I have a PC laptop with an HDMI output, but not a mini displayport.  I have a 27" iMac with a mini displayport jack.  If I want to use the iMac as an external monitor for the PC laptop, can I use a mini displayport to HDMI cable?  Or does my laptop need to have a mini displayport jack as well?
Thanks

This approach will only work if the OP has a 2009 or 2010 27" iMac. It will not work on any other iMacs. What he is attempting to do is called Target Display Mode, TDM is addressed in these two Apple articles:
http://support.apple.com/kb/HT3924
and
http://support.apple.com/kb/TS3775

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    dwh wrote:
    I would like to use my iMac as an external display, keyboard, and mouse for my windows laptop.  Is there a gizmo that will allow me to do this?
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