i have a imac 2009, to use as monitor for an mac air: from Mini DisplayPort to Thunderbolt. But i can not find a single connecting cable? always need two connecting cables? if so, please advice on type or number. thx.
MacBook Air 13″, macOS 10.13
That looks like a Mid 2007 or Early 2008 iMac and it does not support Target Display Mode.
see > Identify your iMac model - Apple Support
Sorry, but Target Display Mode only works with Late 2009 thru 2010 27" iMac's and 2011 thru Mid 2014 iMac's.
see > Use your iMac as a display with target display mode - Apple Support
That looks like a Mid 2007 or Early 2008 iMac and it does not support Target Display Mode.
see > Identify your iMac model - Apple Support
Sorry, but Target Display Mode only works with Late 2009 thru 2010 27" iMac's and 2011 thru Mid 2014 iMac's.
see > Use your iMac as a display with target display mode - Apple Support
Monitor
