Flashing Question Mark in a Folder

Hello All:
I have an iMac 24" (Model A1225; Mid 2007) running 10.7.3.  The CPU will rarely boot up and will boot up with the Flashing Question Mark in a folder most of the time.  I can start up from a OS DVD (Snow Leopard) or Lion on a Flashdrive, but the HDD will not appear when I attempt a reinstall.  I was able to boot up once from my Lion Flashdrive and reinstall 10.7.3 with a normal restart.  The HDD checkout fine using disk utility and I repaired my disk permissions. The CPU seemed fine and this morning the Flashing Question Mark is back. 
I can start up the Target disk mode and I will see the FireWire icon, but the HDD will not appear on the desktop of the host CPU.  I have a new iMac on order, but do you think it is wise to pull my data from the HDD via the Target disk mode or my Time Capsule?  I guess I am not sure if it is the logic board or a bad HD.
Thanks in advance,
Irv

It sounds more like a failing drive or a drive in need of repair. Have you tried repairing it?
Repair the Hard Drive - Lion
Boot from your Lion Recovery HD. When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then quit DU and return to the main menu. Select Restart from the Apple menu.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
If the drive is repairable then you will need to reinstall Lion:
Reinstalling Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alterhatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.
If none of this works then I would definitely backup your data, but not with Time Machine. I would make a backup to a separate drive, not the Time Capsule, using Carbon Copy Cloner.

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