Power Mac G4 MDD not getting past apple logo

Hey,
I was recently given an old Power Mac G4 MDD from my school. It had Leopard on it, and seemed to be running fine. However because the computer had school software, they told me i had to replace the os on it, and gave me the disks for OSX 10.2. After installing 10.2, I restarted my G4, however it did not get past the white screen with the grey apple logo. No spinning wheel either.
The computer has 2 harddrives, and 3x 256 Mb DDR Ram. I am unsure of the processor
Can anyone say what is wrong with this computer/How i might fix it?
Thanks in advance,
Angus

Here's the spec page on your Mac http://www.everymac.com/systems/apple/powermacg4/stats/powermac_g4_1.25mdd.html
It came with OS 10.2 installed.
I have an identical Mac. The gray Software Install and Restore disc has the P/N 691-4679-A & the OS is 10.2.7. You may have been given the wrong installer.
 Cheers, Tom

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HT1338 I have macbook without a firewire port, I have usb 2.0 port, now my os is not working I can not get through apple logo loading , I can not enter safe mode, I can only enter one user mode, how can I backup my data, I have very important data in my h

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Here is what worked for me:
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http://support.apple.com/kb/HT1825
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Cult of Mac post:
When the Apple Logo appears your Mac has found a valid system disk, and Mac OS X begins loading.
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Welcome To  Discussions HSHS07!
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How to show us a screen image. Avoid personal identification.
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The contract on this phone expires March 19. Its not worth getting a new one over a few weeks!

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Power Mac G4 MDD not getting past apple logo

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