Imac crashed and will not boot up

So my iMac crashed and will not boot. The power will come on and when it switches to the boot sequence it powers off.  I bought Black Tie protection at Best Buy but when I took it to them they shipped it to Apple. The problem was never fixed. Apple said it was a software issue to reload the OS. Well i did that and not even a day went by and it is doing the same thing. Any suggestions would be helpful...

I agree with BGreg that you should run Apple Hardware Test , however run it in Extended Mode. If no errors turn up run it several times. It's a lengthy test so be patient. Also here is what Apple says about your symptoms in Gray progress bar appears under Apple logo during startup.
I hope you have been backing up your system, if not then if you can boot into Safe Mode as suggested you should immediately backup using either a clone or Time Machine. That should be the #1 priority to preserve your data.

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