IMac won't start. I get a black screen, not even a grey one or beachball

I Have a 21'' iMac bought in 2012 OS recently upgraded to Mavericks.
A Few days ago I received a system upgrade notice (can't remember the details) which I promptly installed as I always do. Since then the Mac has been switching itself off randomly, with no prompt / command by me. Today it did it three times in quick succession but now it won't switch on again..
When I press the power button at the back I can hear the machine starting to do something (very subtly) but there is no chime, no sign that it's doing anything and the screen remains completely black as if it's switched off.
i Have since turned it off and on several times but get always the same results. I even disconnected from the power supply for a minute or two but same thing happens. Keyboard and mouse also seem to be disconnected.
ANy leads please?

Please make a Genius Appointment and take it in for service.

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Judging by your name I'm guessing I could've anwered this in Dutch.

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Quote
J.C posted "Re: G5 iMac won't start! Help needed." on Feb 4, 2008 4:53:20 PM.
Hi Mel Kev
Have you tried holding down the left mouse button when you turn the computer on. Holding down the left mouse button should force eject the disk.
Hope this helps
J.C
UNQUOTE
And it WORKED! (I really wasn't in the mood to do surgery on the computer this evening). Thanks all!!! You are awesome!
Now, if I can just find the original installation disks.... They are in this drawer somewhere....

IMac won't start. I get a black screen, not even a grey one or beachball

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