Apple PowerMac G5 Powers up Half way from desktop loading up screen goes

Hi All I have A Apple PowerMac G5, Just given free Powers up, i hear the apple chime, It starts to boot/load up, i can see the round spinning thing, happening, but then just about Half way from desktop loading up, the screen goes blank,
I have tried replacing the graphics card, tried replacing the memory, but still nothing, if anyone has any suggestions i would be grateful

Resetting PMU:
http://docs.info.apple.com/article.html?artnum=300341
http://www.felipecruz.com/reset-pmu-and-non-volatile-ram-g5.php
Installing software:
http://www.info.apple.com/kbnum/n106692
Once you determine if this is DOA or worth dealing with...
I would buy a copy of Tiger 10.4.6 now on DVD.
You are going to want/need more than 256MB RAM, too.
I would never rely on a pre-installed system other than when bought new/ref'd from Apple. I would always just wipe it totally clean.
You can find 160-300GB SATA drives for $68 - 120US.
PMU reset would be good idea. and I would make sure that it can boot into the Open Firmware screen where you can also reset nvram. If it can't get into that screen, which is not dependent on OS etc. then you have a more serious hardware or logicboard problems.
Might want to start with Apple's Mac 101 Help:
http://www.apple.com/support/mac101/help/
boot into Open Firmware Reset NVRAM
boot into Single User Mode and runafter any freeze or hard restart or when you need to check the integrity of the drive's catalog directory.
Then, try
Repairing Drives
Complete FAQ
Diagnose & Fix System
Kernel Panics
MacWorld FAQ
Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
G4 MDD 1.25 1.75GB UL3D 15K/10K RAID Mac OS X (10.4.6) SoftRAID 3.5
G4 MDD 1.25 1.75GB UL3D 15K/10K RAID   Mac OS X (10.4.6)   SoftRAID 3.5

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