Where are you located? U.S.? Overseas?
First off not everyone is having issues with this router.
What ISP service do you have? DSL or cable? If on DSL, does the DSL modem have it's own internal router. There is known connection issues if this is the case.
What firmware version is currently loaded?
Have you tried shutting off ALL wireless devices, then powering up the 4500 and one wireless device to see if you can see it? You might need to configure the wireless mode as well. What wireless devices are you trying to connect to it and what wireless modes are supported by those devices? I presume you haven't done any configuration of the 4500 so it should be broadcasting mixed mode. I recommend configuring the wifi for G mode only at 2.4Ghz. Set a name that you know that you will recognize and leave the security open for testing.
Are there any other wifi routers or access point devices in your area? There could be interference.
Help us help you. Then if we can seem to get you going then you can make judgements about this router.
All others i've helped enjoy this router greatly.
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DGL-4500 Gaming and Gamefuel for XBL