Mac Book Pro using iMac OS X 10.5.8 screen as monitor f

[RosieB]

I am very untechnical so much of what I have read on this matter is above my head, but in simple language, if I buy a new MAc Book Pro is there any way that I can use the 21.5" screen on my 2005 iMAc OS X as a monitor? I asked someone at Apple Store and was told that though later models were fully compatible, for one that old I would need special software, but he couldn't say what. An earlier thread posted last year that I didn't fully understand suggests that I don't need software. Any help would be much appreciated as I shall miss my lovely big screen, but the computer itself is beginning to go slow with old age.
Thanks, RosieB

 

[Mackilroy]

Unfortunately no, DisplayPort input is only supported on the 27" iMac.

You could always sell your iMac and use the proceeds to buy an external display, though.