Stuck on Grey Screen

Hello, all. Our iMac has been doing fine until the past 6 - 8 months. About 6 - 8 months ago, we restarted the computer and it never went past the grey screen with the gear spinning.
This has occurred about every 1 - 1 1/2 months. Over the phone, apple support made us do different things to the iMac (hold this, press this, repair disk, etc.). The end result is all the different tricks and options do not help, except re-downloading and reinstalling Lion over our internet. This takes about 15 hours to reload. Once  it is reloaded, the iMac will start up again like normal.
After 2 to 3 of these failures to boot, we brought the iMac to the genius bar. They erased the entire HD; re-installed Lion. We got home. Turned on the machine and followed the instructions for using TimeMachine to reinstall our programs, etc. When the machine was at the genius bar, genius support plugged into our iMac and their program ran diagnostics which did not find anything wrong. The genius support said that if it happened again, we should bring it in for them to do further investigations. They suggested that it might a HD issue.
Last night it was working fine. This evening the computer won't boot up. Apple support suggested I erase the HD, reinstall Lion and then manually move programs and files from my external TimeMachine backup drive onto the iMac. The other suggestion was to bring it in to Apple store and have the store replace the HD to see if that fixes the problem.
The only new event from last night and today was the new Flash update from Adobe. I updated last night. Turned off and on the computer and it was working fine.
We also have 3 virus checking programs on the iMac. I do not believe any run in the background; you have to pay more money for that type of program. We have MacScan, Clam, and Intego VirusBarrier.
Anyone else had similar problems?

Debby wrote:
We also have 3 virus checking programs on the iMac. I do not believe any run in the background; you have to pay more money for that type of program. We have MacScan, Clam, and Intego VirusBarrier.
I just wanted to confirm what others have said that VirusBarrier does install background apps which perform several functions, most of which cannot be disabled in your preferences.
ClamXav does not default to background processes, but you can set it to do a daily definitions update as well as a scheduled scan. ClamXav Sentry can be configured to watch one or more directories (folders) if desired.
MacScan comes with a separate MacScan Scheduler that can be made to do just what the title indicates.
As long as only one of them is performing real-time scans, they should be able to work together. I've had all three (and others, briefly) on my computer for years without issue.

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    2) Start in Safe Mode. Press the power button to turn it on, and before you hear the Startup "Dummmmm" chime, hold down the Shift key. For a few sec, you won't see the Apple logo. Keep pressing the Shift key until you see it. If you press it after the Apple logo appears, start from Step 1 again.
    3) This time, your Mac should take longer to boot. (Like a minute or 2 longer as it is going thru the necessary files to boot from, and not just everything like in Normal Startup mode; which caused it to hang)
    4) Does your Mac boot sucessfully to the Login Screen or Desktop? The login Screen should show SAFE MODE in red at the top. The Desktop should have Sound disabled and seems a lot slower. If you see either of these, backup ALL your files (if you have not already done so) on to an External HDD. Create a new User Account in System Preferences>Accounts with about the same info as your current account (The name will have to be different though, if your previous account was John, this time, add your last name as in John Appleseed.) Make sure it is an Admin account. Then, login into the new account and delete your previous account. Copy all your files over to your new account and restart your Mac correctly by going to Apple Menu>Restart.
    5) This time, don't press anything and let it boot normally. Does your Mac boot correctly? I hope that helps you a little. Get back to me if it does not work!

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