Why won't my computer start up? Whats this mean?

I have a power mac G5 (Power PC) I havent used the computer in years and I started it up one day and no problems.
A few days after running the computer it wouldnt boot up its OS. Below is a link of the grey screen. After the wheel spins for about 45 seconds and then the wheel turns to a low resolution pink box. After this spins for a few seconds the computer stays on and the display turns black.
Im able to boot up in safe mode.
Image 1 - Close Up of Image 1
Any help would be appreciated.
Tom

Hi, your links give this...
Error (403)
It seems you don't belong here! You should probably sign in. Check out our Help Center and forums for help, or head back to home.
Lkely a Graphic card problem, have you blown the dust ouy lately?
More info on that...
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts (Users & Groups in later OSX versions)>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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Why won't my computer start up? Whats this mean?

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