Computer not showing up in Network Map

Hi,
Running NM 5.5.9195.0-Pure0/Platform 11.2.9195.1 through a DLINK DIR 655 Cable (Comcast) Modem Hardware Version A3 and Firmware 1.21.  Connected wired to Dell Desktop Windows Vista 32bit. via Intel(R) 82566DC-2 Gigabit Network Connection.  Home network consists of another Dell desktop (wired) and two identical Dell Laptops (Dell XPS M1530), Canon M6590 Network printer (wired) and a Hawking HWNREN1 300N range extender (wireless).  All computers have Norton Internet Security 2010.
The map in network magic shows all computers and devices with the exception of one laptop when it is powered off.  As I said above, the two Dell Laptops are identical.  When both laptops are powered up, they are displayed.  If both laptops are powered off, only one remains visible in the map (it shows a "dimmed" dotted connection line to the central modem in the map).
I can not figure out why the other laptop is not displayed in the map when it is powered off.
Any ideas?
Thanks in advance.

Oh!  And here's another weird thing.  My nephew was visiting yesterday, helping me move furniture and he asked could he get on my wifi.  I opened the network lock and put the password in his phone myself and it never gave me a notification that he had connected.  Later, my dad came over and when his phone connected to my wifi, it let me know that he had connected.  Wonder what's different about these 3 devices (blu-ray, 2 iphones).  None were listed in the network map before I allowed them to connect yesterday.

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