Power Mac G5 wont turn on

Hi i've just been give a power g5 from a friend who has just upgraded. The problem i am having is it will not start. When i press the on button the led light comes on and the fans move for a split second then i hear a click from around the pwr pack area and the light goes out and the fans stop. Could this be the power pack.
Cheers

Hi! Could be the power supply or several other things. I'd start by checking the battery. It should be at or near 3.6 Volts and a weak one will prevent startup. Tom

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              Media Type: DVD-R
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              Erasable: No
              Overwritable: No
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          Revision ID: 0x0000
          ROM Revision: 113-99702-122
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              Depth: 32-bit Color
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              Main Display: Yes
              Mirror: Off
              Online: Yes
              Quartz Extreme: Supported
              Rotation: Supported
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          Type: DDR SDRAM
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          Vendor ID: 0x1033
          Device ID: 0x0035
          Subsystem Vendor ID: 0x17c6
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          Revision ID: 0x0041
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          Bus: PCI
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          Vendor ID: 0x1033
          Device ID: 0x0035
          Subsystem Vendor ID: 0x17c6
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          Revision ID: 0x0041
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              Disk Sleep Timer (Minutes): 10
              Display Sleep Timer (Minutes): 10
              Sleep On Power Button: Yes
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              IPv6:
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                  Proxy Configuration Method: 2
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                  Display Terminal Window: 0
                  Redial Count: 1
                  Redial Enabled: 1
                  Redial Interval: 5
                  Use Terminal Script: 0
                  Dial On Demand: 0
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                  Disconnect On Idle Timer: 600
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                  Disconnect On Sleep: 1
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                  LCP Echo Failure: 4
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