Blank screen but powers on

i have an older imac bought in i think about 06 i cut the power button on and you can hear it powering up and the light in bottom right hand corner also lights up, but there is a blank screen. No picture at all. What can possibly be wrong. please help.

Very difficult to troubleshoot but almost certainly it's a hardware failure of some type. My guess is one of these three:
Failed HD
Failed Graphics Card
Failed Display
If you have another Mac available  you can try connected the two via Firewire Target Mode (Google it) to see if you can see the HDD, if you can then you know it's 2 or 3. My recommendation though is to take it to an Apple Store or AASP to be professionally diagnosed. On a 6 + year old system it's anyone's guess.

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