Connecting to 802.11a AP using WPA security - no go

I have an AP that is set to 802.11a (5GHz) using WPA security and is set to hide its SSID. My iMac is connecting to this AP without any problems whatever frequency i set on AP, hide/show SSID. The problem is - Macbook does not show this AP in AP list when requested, if i select other and enter correct settings (ssid and WPA passkey) it says - connection timed out, AP does not show any signs that something even tried to connect to AP.
the only resort is to use 802.11g when i can connect to AP without any problems.
in Network utilities it shoes that it supports 802.11a/b/g/n
hope i gave enough details.
later today i will try to set WPA2 instead of WPA, also will try to set no security settings at all.
any thoughts how to force it to connect to 5GHz AP?
edit:
forgot to say why i want to switch to 5GHz - the problem is - lately many 2.4GHz b/g APs popped up in neighborhood and started to cause latency/interference as some manage to follow me over frequencies i set up.
Message was edited by: janiskr

ok, setting to WPA2 solved the issue, because still, with WPA configuration i was not able to connect. allowing TKIP and WPA2 allowed macbook to connect. Also iMac changed the settings to WPA2 and it didn't matter that it had correct settings fot WPA.
weird.
maybe someone could point out how to set these things explicitly, so i can choose what settings are in use.

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This question was solved.
View Solution.

HI,
firstly, apologies for the delay getting back to you. Poor health has meant I've had little time nor inclination to do much on the computer side of htings.
Anyway, I'm please to say the problem with the HP 3050 failing to connect to my network is now solved. It seems to be a bug with the setup software, and that seems to include the latest version posted Dec 2010.
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7. Log back into the router's control panel and re-apply the security options. Be sure that they match those match those entered for the printer.
Hopefully this will be of use to others in the same position.
Thanks again for your time.
Best,
H.
It's not the fact it can't be done, it's the fact it hasn't been done, yet.

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