You may have a software conflict. Start your computer and immediately press the "shift" key. Hold it until your computer starts. If this works, something you recently installed is interfering with the start-up process. But if the computer still will not start, try this:
Insert the original system CD and restart computer, pressing the "c" key until it starts. This will force it to start using the operating system on the disc.
Once it has started:
1.Open the Applications" folder.
2. Open the "Utilities" folder.
3. Launch Disk Utility
4. Select "First Aid" from the bar in the upper middle of the window. Your selections should include: First Aid, Erase, RAID and Restore.
5. Select "Verify Disk" from the screen that appears. Make certain you select the computer's internal hard drive in the menu on the left of the Disk Utility screen. The software will examine your hard drive and correct any errors. This may take some time.
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