Power supply clicks twice when plugged in.

I'm new to Mac however I've been a certified PC tech for many years. I recently purchased my first Mac. It worked fine but needed to have the fans cleaned out. I removed the components and power supply just as I would have done for any PC (I was using heel straps and working on an ESD safe workbench). Upon cleaning the components I reassembled the tower (no left over pieces) and heard two clicks coming from the power supply when I plugged it in and when I unplugged it. After troubleshooting the components individually, and still hearing the two clicks I decided to remove the power supply and test it independently. When I plug in the power supply w/o being attached to the tower I still get the same two clicks (making a relay opening and closing sound) no fans or LEDs come on. Falling back on my years in the industry and common since I decided that the power supply needed to be replaced. After receiving the new (not refurbished) power supply and installing it I'm still getting the same two clicks. At this point due to frustration I break down and call the pros. I called four Mac repair facilities (three third parties and The Mac Store) with a question "is it normal for a G5 power supply that is not connected to the logic board to make a relay open and closing clicking sound" and didn't get much help. Since I'm new to Mac I'm unfamiliar with the characteristics of the hardware. I know that if I were to plug in a normal PC power supply w/o the logic board nothing would happen, but I was told by two of the Mac techs that a Mac power supply would still make the same relay noise w/o being attached to the logic board. The problem is that I have now dropped a fair amount of money in this G5 and I have nothing to show for my investment and I don't know where to go from here. If two of the Mac techs were right then I need to send the new power supply back for an exchange, or if the other two Mac techs were right I need to replace the logic board.
The specs are:
1.8GHz Duel Processors
160G Hard Drive
600W Power Supply
2G RAM
512 Video Card
Any help would greatly be appreciated.
Thank you,
Brian M

Dear Brian,
I'm sure that clicking relais sound is the normal behaviour of every G5 power supply.
Did you use the official service manual for the specified computer? If not, you can download it here (I don't know which of the two files is appropriate for your computer, but one of those certainly is).
The 512 MB video card is not the standard configuration: the maximum amount of VRAM for an Apple supplied ATI or NVidia was up to 256 MB.
Lots of success resolving the problem and regards,
Robbert

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