My Mac Pro wont power on please help

My mac pro wont start up.
I have already checked the power supply, fuses and have tried to zap the PRAM and changed the internal battery.
The on/off button is completely unresponsive and no light is showing on the monitor

To make progress, you need the fans to come on and the Chime. The conventional way to debug this issue is to remove EVERYTHING that could be drawing down too much power, and try for the chime.
Remove:
Graphics card
any other PCIe cards
Hard Drives
DVD Drives
external devices like USB devices
all but one pair of DIMMs
Then try to power it on. If it chimes, or the power light flashes, it's alive and can be debugged. Add back one item at a time and try for more.

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