Power mac g5 doesn't boot

Dear Apple Users,
I use an old power mac g5 and for some weeks I had prolbems loading all the fonts and some other hints of an coming breakdown.
This morning I startet the g5 and everything worked fine. After trying to restart it, the g5 wasn't able to boot again. I'm not sure whether it's an software or hardware-problem. Unfortunately I cannot find my system-dvd anymore. Do you have any hints whether it's usefull to buy another DVD or do you recommend to look for another hard drive (it isn't intell-baded, PPD). Do you have any experiences which could help me solving that problem?
Thank you for your help,
utomred

Hello,
Couple of things to try...
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 & clear caches.)
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
You may need a new Hard Drive, but it wouldn't be any use without an Install Disc.

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The dvd is black with the X on it and has this number on it - 2Z691-5305-A
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Compatible with eMac (2005), iBook G4 (Late 2004), iBook G4 (Mid 2005), iMac G5 17-inch (ALS), iMac G5 20-inch (ALS), iMac G5 (17-inch iSight), iMac G5 (20-inch iSight), iMac (Early 2006 17-inch), iMac (Early 2006 20-inch), Mac mini, Mac mini (Late 2005), Mac mini (Early 2006), MacBook Pro, Power Mac G5 (Early 2005), Power Mac G5 (Late 2005), PowerBook G4 (15-inch Double-Layer SD), PowerBook G4 (17-inch Double-Layer SD).
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Power mac g5 doesn't boot

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