Power mac g5 start up problems

i have a powermac g5 and it was working fine yesterday, now today i turned it on and it showed a world flashing icon and i waited forever but nothing happened... then my friend tried to start it and it did the same thing but this time it showed the flashing world icon which its blue then after awhile it showed a flashing question mark then it finally showed my desktop
i seriously need some help it is running even slower than ever

Hi there, it's having trouble with the Hard Disk.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Tiger Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

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