Screen has cut out, desperately need help!

The screen on my iMac has cut out. It has happened before and I have had to restart the system to get it back. This time however that hasn't worked. I have booted up the system and can access the files using a second machine via ethernet and the screen did come back briefly when I pressed the ctrl ket before going blank again. I am pretty sure it is not a hardware problem but desperately need a suggestion to help recover the situation.

When I start the machine the screen briefly goes white after the startup chime then goes black again. The same thing happens when I do command-R. The system continues to boot up and I can access the files from my other machine. On two or three ocasions the screen has momentarily come on when I have touched a key or the mouse. For a brief second everything looks OK then it is gone again.

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