I recently had a Hard drive failure, got the flashing question mark

Hello,
I recently had a hard drive fail on my IMAC.  The power went out in my home and knocked the computer off.  When I turned it back on I go the dreaded white screen with flashing folder/Question mark.
I tried all the tricks I could find (on my other computer search) but nothing worked.  I also inserted the install disk and then tried the "disk utility" ... this is where I got really scared...the utility saw my Hard Drive, but showed nothing on it with 0 space available.  I thought I was fried and actually ordered a new hard drive online.  (This is the second time in 3 years this has happened ... and wouldn't you know my extended warranty expired 2 weeks ago)
The next day, I think ... well, let me just try booting up to see if a miracle will happen.  Low and behold it booted up!  My drive is there, all my data everything!  (and a new hard drive on the way overnight! lol)
So my friends, what the heck is going on?  I immediately repaired permissions once I brought it up.  But I'm afraid to shut the thing off now in fear it won't come back. 
Any Ideas?
Thanks,
Ryan

Assuming you have some backups:
Drive Preparation and OS X Installation
1.  Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs) then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
When formatting has completed quit DU and return to the installer.  Complete the OS X installation.
If the drive is not failing then the above process will find any possible bad blocks. If no bad blocks are found and the drive reformats, then reinstall OS X. If the drive does fail and you have another you can install, then try that. If this doesn't fix things then take it in for service.

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