Why does iMac 2007 keep going off during power up?

I've tried starting up several times, including in safe mode.  The bar gets about ¼ way along, then everything shuts off, again.
No idea where my original disc is, but the DVD player hadn't worked for a few weeks now either.
Not sure what to do.  A similar thing happened a few years ago when the screen would just go gray and freeze on start up, and the machine had to be sent away to be repaired. 
Any ideas or suggestions?

Managed to get it going agin by doing a restore from my backup. Had to do the <Command, R> during power on, and do it from there.  Hopefully it will be ok now.

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