I Mac and lost wireless connection

Hi...I have a 2.5 year old IMac and pretty much since we purchased it, we haven't had a strong stable connection with the wireless router. We figured it was the router and had Comcast come check. It was ok. We recently purchased a latptop (not apple) and have absolutely no issues connecting to the router. We never lose the connection. Totally opposite to the Mac. Has anyone else had this experience? I'm hoping that there is a simple solution. Would love to be able to have a great connection with the IMac.
Thanks!

A good starting point would be to install something like iStumber or Kismac on your iMac. This will let you check what your mac is seeing for signal strength.
iStumbler: http://www.istumbler.net/
Kismac: http://www.versiontracker.com/dyn/moreinfo/macosx/17199
This will help determine if it is perhps a hardware issue, interference from something in your environment, other networks, etc.
Where is your router situated? Where is the iMac situated? Have you tried moving either?
http://compnetworking.about.com/cs/wirelessproducts/qt/locate_aprouter.htm
If you haven't tried already, create a new user account on the iMac or enable the guest account. Same problems? If not it may be related to something you have running in your profile.
If you are using a wireless 'g' router, wireless g users should only use channels 1,6, or 11. These channels are the only three channels with no overlap. What channel is your router on?
see: http://www.tomsguide.com/us/how-to-wlan-collide,review-236-3.html
Have you checked to see if you have the latest firmware installed on your router? Latest software on the iMac?
Hope this helps!
Michael

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