I have an original imac on the shelf that I can't seem to get working again.
The machine worked perfectly fine , but I decided to add more ram. I added the ram , tried to boot , the machine gave me a frowny face , so I figure the ram wasn't compatible. I take the ram out , try a reboot. Nothing , still frowny face.
And that's it , you turn it on and it gives a frowny face. Sure would be nice if instead of a frowny face it actually said what was wrong , so that , you know , it could actually be fixed.
Maybe they changed it in modern macs but not this one , where do I start?
The question mark means it cannot find a boot device. The connection to the hard drive may be loose, or you may have had particularly bad luck and had the hard drive fail while you were replacing the RAM.
Do you have the model/year the iMac was manufactured? You can derive this from the serial number and EveryMac's Ultimate Mac Lookup.