Sorry man, I went through this with my Dual 2GHz G5...your logic board is dead, computer wont work till you replace it, and even that is no garantee your RAM/CPU's are in working condition, logic board failure tends to eat components like that.
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PC3-.... (as an example PC3 - 8500) denotes theoretical bandwidth (with the last two digits truncated using ....), and is used to describe assembled DIMMs. PC3 is a DDR 3rd generation RAM.Read more from here
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this is the link to get a service manual in English. www.scribd.com/doc/103410/xserve It includes detailed instructions, like use static electricity wrist bands. 1. Shut down the computer. Remove the power cable.2. Unscrew the two finger screws on the front panel, remove the computer from it's case by pulling forward, and place it on a solid surface. Be careful. It's heavy and hard to handle. DON'T DROP IT.3. Unscrew the one finger screw holding the Power Supply in place. Lift the power supply out by the metal support near the 14 pin connector to the motherboard. There is a pin in the back panel of the computer, so the back end of the power supply rotates when the end closest to the front lifts.4. The 14 pin connector is has a lot of friction. I have never gotten it to come up easily, as it is supposed to. I usually use something to GENTLY lift up the metal cover/bracket over the 14 pin connector on the front end.5. If you are taking this out because you are replacing it, you should read what the manual says about checking the battery, resetting the PMU [AKA "zapping the PRAM"?], and checking for 12 volts of power from pin 1 to pin 8 on the 14 pin connector. 6. This isn't in the manual: To get at the 1 and 8 pins on the 14 pin connector,A. Removed the power supply, as described above. B. Removed the three screws that hold the metal cover/bracket over the 14 pin connector on the front end.C. Removed the cover/bracket to expose the tops of the 14 pins.
make sure there is no disk in cd rom drive if there remove it and also check the amber led in front panel which is indicating the problem still if you are not able then open it and check the ram. And the power connector in motherboard and also the cmos battery or reset the bios.