there is no picture or video just loud fan

Push power button, chime sounds, but there is no picture or video on the display

I did PRAM RESET by Shut down the computer Waited 5 second then press

Command, Option, P, and R. You will need to hold these keys down simultaneously

I can Hear The HD Is trying turn On with Loud fan noices ...what should i do next?

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What happens when you connect to an external display?

crwdns2934271:0N'w 7, 2010crwdnd2934271:0 rab777hp crwdne2934271:0

how can can i connect xternal display ? do i special cable ?

crwdns2934271:0N'w 9, 2010crwdnd2934271:0 lutaph crwdne2934271:0

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Here is a link to Apples check out procedure. Hope it helps you.

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+ very nice link. also open it and check for corroded or swollen capacitors

crwdns2934271:0N'w 10, 2010crwdnd2934271:0 mayer crwdne2934271:0

iMac G5 17" Model A1144