Imac wont start up after new RAM, no chime, black screen

Hi, I've recently purchased a used 2010 iMac i3 that had faulty RAM.
This was confirmed as the issue when I tested a friend's original RAM from the same age iMac and the machine worked perfectly.
I then ordered 2x 4gb Crucial memory (upgrade from the 2x 2gb already installed) but kept getting kernal errors and RAM integrity check errors so the modules were returned and replaced by crucial.
Prior to returning, I attempted to reinstall a fresh copy of mavericks, but the hard drive failed to completely format, and then the OS install also failed so the machine currently now has no operating system. However before returning the ram the machine would boot up and connect to the internet to attempt to download the OS again.
The replacements have now arrived, but after installing the machine won't even boot. First attempt to start there is a drive noise, and the fans run, but no chime and a black screen. If I force shutdown and try again the drive noise happens twice and the fans run, but the same outcome.
If I remove the RAM I still get the single bleep, and once of all of the times I've removed and reseated the RAM I've had a triple beep integrity check fail.
Any help would be massively appreciated. Lost now as to whether the issue is with crucials RAM or the iMac itself.
Thanks

Do you still have the old ram? Was orig sticks of ram bad? What happens if you put only one stick of the orig ram back in ?

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Hi @ESAWatson91 ,
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