Mac mini does not start up after password is given

Our mac mini is strating up, but when entering the right password there's coming a blue screen and you return to the login where you have to enter your password. Whe are sure we are typing the right password but the mini is not starting up and every time returns to the login user screen.
OSX 10.4 and not a intel mini.
Can anyone please help us.

Hello, first try this...
"Try Disk Utility
1. Insert the Mac OS X10.4 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 at top of the screen. (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, (not Repair Permissions). 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 & clear caches.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

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Mac mini does not start up after password is given

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