Aluminum Cordless Keyboard Loses Bluetooth Connectivity to iMac 24" 2.4ghz

I sent my keyboard that came with my iMac back to  for a replacement it was a
cordless Aluminum Keyboard it would lose it's connection with my iMac's BT
or did the iMac lose it's Bluetooth ?
I now have a new keyboard same type cordless Aluminum and it's doing the
same thing I will go to the BT Menu Bar and it says
no BT items connected I've Zapped the P-ram
repaired permissions, unchecked for Bluetooth to wake
computer in Energy settings and I've read where a clean install
doesn't help. Has anyone figured this out as I don't believe this
started happening until the 10.5.2 update
_I have installed all updates and Firmware updates also._
*iMac 24" 2.4ghz, USB Epson V350 Scanner and Epson R380 Printer USB*
*2 external HD's attached, Logitech VX Revolution Mouse*
*Centurion CD Organizer these are the peripherals I have connected*
*to this iMac with a 802.11n Base Station as my*
*wireless Router with 3 HD's USB connected to via*
*a Powered Hub..*

I called  on 4.23.08 and they are saying
that my iMac 24" 2.4ghz may have a bad or
loose BT Connection inside of the iMac itself
they are sending me a USB Keyboard for my trouble
and they told me to take my iMac into a  Retailer
to have it checked out to see if indeed that my
iMac's BT chip is loose or is bad so that is the route
I'm going to take and I greatly appreciate all the help
and to answer about the Sharing Bluetooth hasn't been on
on this Mac ever so I know that isn't the problem
I threw the BT Preferences away but that didn't help either
hope we can find out what's going on..!
I will leave this discussion open until I take
my iMac for service and if the BT is bad on the iMac
or is loose that would explain it if not we will
keep digging until we find out something...!

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Aluminum Cordless Keyboard Loses Bluetooth Connectivity to iMac 24" 2.4ghz

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