Not reaching the boot chime

I have gone through all of the usual steps when dealing with a boot problem. Unplugging and replugging. Safe boot. PRAM reset. Holding the option key. I have even replaced the battery on the logic board. My problem is that my iMac (intel 20" 2007 running Mavericks10.9.5) is not booting. It stops (gets stuck) on the test of the drives. My optical drive tests over and over again. So the computer never gets to the boot chime or the apple. I am out of ideas and the internet has not produced any more then the above mentioned steps. The only time it has booted successfully is when, after changing the PRAM battery, I accidentally held the power button when I plugged the computer back in. I thought it was good to go and promptly restarted. I have tried to recreate the mistake but all that happened was it turned all the fans on high and still did not make it to the chime. Any advice before I have to buy a new computer?

Try to set up an appointment at the Genius Bar, as that seems the only solution left since you've tried everything already, but explain to them what you've already tried, and hopefully your problem will be fixed soon so that you won't have to buy a new computer.

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