Dell Optiplex GX280 beep code

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Code Butcher

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I got a Dell Optiplex GX280 tower, P4 3.2Ghz DDR2. When I start it up there is a long beep followed by 5 short beeps. I know the beeps mean something, but I don't exaclty know. I've tried changing the RAM, to no avail. Could it be video, because there is no signal to the screen?
 
Thanks, I took a look, but still can't seem to find my problem. There are 4 lights on the back A B C D, A and B are Orange, and C and D are Green. If that helps.
 
It's a memory problem alright! But the memory is fine. I removed one of the DIMMs and it booted fine, then switched to make sure the other one was bad, still booted fine. Then I installed in the 2nd DIMM slot, booted ok. It seems that it won't boot in Dual Channel. Is this something I can fix by changing a setting or is my forever locked into Single Channel mode?
 
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