How to run diagnostic on your mac before installation?

Is there a way to do that even though my hd needs to be installed with an OS?
during installation, it powers off... So I want to know what's wrong...

This depends a bit on which mac you are using, so posting that information would help us out here.
You can likely run diagnostics off the recovery partition or installation disk (depending on what mac and OS you are using). Instructions here:
http://support.apple.com/kb/ht1509
If you are on a newer system, as per the directions linked to above, just hold 'd' while starting up.
You can also run disk utility from the installation DVD (hold option while starting up and select the DVD) or recovery partition (Hold cmd-r during startup), and use it to verify/repair disk errors.

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