POWER MAC G4 MDD WON'T TURN ON

i went to turn on the computer and it wont turn on? i need it to work it is my only mac and only computer i have i am on a library computer now. i have over $750 in parts and upgrades on this computer.
G4 MDD 2GHZ 2GBRAM 3 750GB HD'S 512 MB VIDEO CARD DVD-RWDL  2 USB 2.0 CARDS ONE SATA CARD

Whew, could be a bunch of things, how old is the PRAM Battery?
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/ 
How to reset the SMU/PMU on a Power Mac Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Remove the PRAM Battery, AC power, all peripherals, including Monitor, Mouse, KB, everything, let sit a few hours or overnight... replace everything & try starting it up.
Might also reseat any PCI cards & Graphic card.
https://discussions.apple.com/message/15009563#15009563

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