What program to check hard drive?

My computer is acting up (G5) and I need to find a good program to see if the problem is with the hard drive or system.
The Disk tools just say invalid postcount and that it cant complete the examination

When you boot to the install DVD, select your language and then from the Utilities menu select Disk Utility. Select your HD from the left side column and then select Repair Disk.

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    No need to type in all caps - we HEAR you!
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    mende1, greetings:
    mende1 wrote:
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    Hi Robbie,
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  • How to check hard drive health

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    Message was edited by: macjack

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