Early 2008 iMac won't boot up

My early 2008 iMac was getting slow. It didn't really seem to have anything wrong with it other than being a 5 yr old middle of the line model with 4 GB of ram. But I decided it was time to upgrade and so bought a new iMac. After transfering files & apps to the new computer, I shut down the old one and moved it. I used it in my piano teaching studio, and so was intending to set it up for students to use. When I went to boot it up, however, it wouldn't. I unplugged it (from the computer and the outlet), then plugged it back in after a couple of minutes with no luck. I was told some time ago you didn't have to do this, but not knowing of anything else to try, I unplugged it again and then tried pressing the power button as I plugged it back in. No luck.
Any thing else I might try before taking it to the Apple store and seeing if they can start it?

Thanks for trying. I'd rest SMC before, but did it again just now with no luck. One thing that's weird is that since I moved it, the power cord, keyboard usb cable and wireless mouse usb transmitter have been difficult to remove. I actually had to get a pair of pliers to remove the transmitter (gripping the transmitter firmly but gently through a cloth so as not to damage it). I don't know if that would have anything connection to it not starting (I can't imagine how), but it's a notable change.

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