Intel iMac won't boot & Disk Utility error-can't verify disk

I posted earlier today that my 24" intel iMac (2.4Ghz Core 2 Duo) froze yesterday after a Safari crash. I had to shut it down with the power button. Since then it won't start up. Sometimes it starts, then shuts off. Other times it starts, then the little gear just spins. I've done the keyboard commands for RAM, the complete disconnect of power, then reconnect, and the Disk Uitility with the install disk. When I do Disk Utility to verify, it gives me a red-letter error that it cannot verify on both verification checks. I have also tried, via the install disk, to repair by using a Time Machine backup, but that utility has been spinning and spinning on my Time Machine for hours, and I cannot even click the "Continue" button because it is busy (checking the time machine?) 
I am out of ideas as to how to move on from here. My AppleCare expired 2 months ago, so that's a problem. I've had no major issues before now, except for earlier this year when Mail wouldn't open for some reason. Anyway, I'm at my wits' end here. I NEED my Mac. I'm disabled and have no better source of entertainment or socializing. My hobbies are editing audio, video, & photos. Without my Mac, I'm just in the middle of the sea in a raft with no oars. Any helpful suggestions will obviously be much appreciated. Thanks.

Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard 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. 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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.

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