Internet won't connect on imac but works on other devices

new-ish 20inch imac won't connect to any wireless networks (our own and the coffee shop next door) but other devices (iphones, macbooks) will.....this imac is used as a register in my retail store and without internet we are unable to process credit card transactions..we are losing business. HELP!!! thank you!!!

HI,
In most cases this is about the Internet Speed or the portion of it your computer gets that iChat can see at the moment it tests the speed during it's launch process.
That is to say that as you start up ichat it tests the speed it can see.
this can be effected by other computer doing a download and "taking" more of the Bandwidth or rather leaving a smaller amount for your Mac.
The same is true if your computer is already doing a download or using the Internet heavily.
Of course at that moment your ISP could also have cut the speed you get.
If you launch iChat and go to the Video Menu > Connection Doctor what does the Capabilities tab say ?
This may have red crosses against some items.
Also check iChat Menu > Preferences > Video Section > Bandwidth Limit
This should not be set at 100kbps fro Video chats.
Have you tried restarting the computer ?
6:54 PM Friday; March 30, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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