My imac turns on.. but the screen doesn't!

I woke up my computer from sleep one day by using the mouse and then it brought me to the desktop... then it froze. So, I simply did force shut down by pressing the button. Now when I press the power button, computer turns on (I hear the fan and CPU turning on) and the light on the bottom right corner lights up, but the screen doesn't show anything; it remains black. There is no dong startup sound or apple logo startup or anything. I tried doing the PRAM reset (that did nothing since I can't see the screen anyway). I have no warranty or anything. Can someone help me with my issue? Thanks.

Did resetting the SMC help for you? Or have you found another solution.
I ask because the iMac I have is doing exactly the same - the disk spins, fan makes noises, white sleep light comes on (permanently) but the screen stays black.
Resetting the SMC did not work for me plus I also tried removing the RAM and re-inserting - still no joy.
I also tried the thing where you plug the power cable back in while holding the on off button in - in this case the fan just went onto maximum speed until I turned the iMac off again.
Any help will be appreciated.
Thanks

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