Sleep to Wake=NO Internet Connection!

i've been experiencing past 2 days now.

whenever turn computer on, i'm able go on safari , mail (i ichat also, it's not working reason).

anyway, when put imac sleep, , wake up, i'm getting error on safari, saying i'm not connected internet.

charter modem has lights on green.
airport express has green light on. (i'm using wireless connection).
wifi signal strength on top right corner of screen on full.
when click on network diagnostics, got green light 6 categories.

imac connected internet, reason, every time wake sleep mode, says i'm not connected.

spent 55 minutes apple care, first 20 minutes guy, before transferred me supervisor further assistance.

did said, pulling power cord, holding down power button 15 seconds , turning imac on, deleting bunch of files , caches, changing airport location, doing hard reset airport express. went through stuff, , nothing helped. couldn't figure out wrong!

am experiencing problem, or other people having same issue?

also: clicked apple icon, went system preferences, keyboard, keyboard shortcuts, launchpad & dock, , clicked on show launchpad , used f5 button press open launchpad.

reason, when click on f5 it's taking me mission control! not have f3 sends me mission control, f5 now!

restored default settings, , tried f5 again, keeps opening mission control instead of launchpad. tried f6 shortcut, wasn't working!

again:
am experiencing problem, or other people having same issue?

 

as wifi: http://forums.macrumors.com/showthread.php?t=1198324


keyboard, need pram reset , make sure setting hotkeys cleared or set properly.

 

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