No backlight - Imac intel based

Hi I was hoping someone could help me-
My Mac is the most treasured thing I own and has always worked perfectly since I
bought it approx. 2 years ago.
Recently I went on a business trip to America from the UK. I left the clock on my mac set to the time in America so my partner could check the time difference.
When I arrived home last night with some trepidation he told me it was broken.
Well it's not broken it just has no light in the screen.
When you turn it on, you hear the start up noise and fan running but the screen is totally black.
However when you shine a light on the screen you can barely but just be able to see the icons on the screen as it should look.
Its as if there is no light in it, but I have no idea how this just happened.
He used his own laptop for the 2 weeks I was away and assures me he did nothing, that he looked on the time and put back to sleep and then the next time he went to check it, the screen never 'woke up'.
I really needed to use the computer to upload all my photos taken on the recent business trip as well as to finish the artwork for the business. I only have a few weeks and I'm very worried that I will have to send this off to apple and won't be able to do my work.
The back light on the power button also does not seem to be working. No flashing no nothing.
When i bought the mac it had a tiny sort of smudge in the top left corner, like a patch of white smoke was trapped in the glass. I have no idea if this is relevant, but now that it is black, the patch seems to look bigger and more obvious than ever. I just wish I'd had the sense to mention it at the time, I did have apple care package but only for a year, which is now run out.
It;s so frustrating as I can almost see my screen but only in the dark with a torch - this is no good obviously and I must get it fixed as asp
If anyone has any advice I'd be very grateful-
Many Thanks

Don't worry - neither of the procedures I have suggested threaten your files, folders, etc. They are commonly used procedures for trouble-shooting problems such as yours. Have a look here for more info on resetting the PRAM: http://support.apple.com/kb/ht1379
and here for SMC reset: http://support.apple.com/kb/ht3964 (make sure you click on the iMac link down the page a bit)
They're both easy to do, safe, only take a few minutes and might save a call to Apple.
Now get some sleep

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