Wake for network access what has happened?

Hi everyone...
When snow leopard came out I tried the wake for access feature and used it quite often... Because the computer screen used to come on at night (no clue why) I reluctantly turned the feature off. Now I would like to reuse it and it doesn't want to work.. Why not? Is there a system preferences file that is corrupted?
First my setup:
iMac running 10.6.3 under energy preferences I've rechecked wake for network access. This is connected by ethernet to
My airport base station running firmware 7.4.2 and it is a 802.11n model and as such "wake from sleep over network" compatible
trying to access the imac is a macbook (early 2009) also running 10.6.3
Now when the computers are running, they show up under "shared" and I can connect/share screens without a problem.
Sadly when the iMac is asleep it doesn't show up under shared (it used to when I tried the feature last Winter.
The only difference that I am aware of is that my imac was repaired a couple of weeks ago and the whole motherboard and network components were exchanged. Could that have anything to do with it?
Also I do change preferences fairly often. Is there anything that I'm missing? On a related note, I do now hear my computer sometimes cycle up (screen now off), which makes me think the system is waking up to report to the base station. But why is it not showing up?
Thanks for any and all help. Hope everyone has a good start to the week.
Phillyman
Below a part of my console during the night..
4/12/10 4:17:19 AM kernel Wake reason = RTC
4/12/10 4:17:19 AM kernel RTC: maintenance alarm 2010/4/12 02:17:19, sleep 2010/4/12 00:17:21
4/12/10 4:17:19 AM kernel System Wake
4/12/10 4:17:19 AM kernel Previous Sleep Cause: 5
4/12/10 4:17:19 AM ntpd[39] sendto(17.151.16.21) (fd=26): Can't assign requested address
4/12/10 4:17:20 AM kernel Ethernet [AppleYukon2]: Link up on en0, 100-Megabit, Full-duplex, Symmetric flow-control, Debug [796d,6f08,0de1,0200,45e1,4000]
4/12/10 4:17:21 AM ntpd[39] sendto(17.151.16.21) (fd=24): No route to host
4/12/10 4:17:27 AM configd[14] network configuration changed.
4/12/10 4:17:27 AM ntpd[39] sendto(17.151.16.21) (fd=24): Network is unreachable
4/12/10 4:17:35 AM ntpd[39] sendto(17.151.16.21) (fd=26): Network is down
4/12/10 4:17:36 AM configd[14] network configuration changed.
4/12/10 4:17:37 AM kernel System Sleep

On the affected M<ac look at it's logs using /Applications/Utilities/Console. This way you can find out if a third party program might be waking it up to call home.

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