Successful install and restart but failed to restart again, fan loud

My Mac would not boot up. It showed a grey screen with a no entry logo and the fan sounded like it was going to take off. I switched it off and tried again (3x) no good. I used my husband's pc to read the discussions and tried BobP1776's advice to switch on with the Apple-alt-P-R keys held down until the second chime, everything is working again. I did the disk verify thing too and everything is fine. Thank you Bob. I'm not a natural computer fixer so I appreciate the help.

The first fix has sadly failed. A power cut shut down my iMacG5 last night and the grey screen with the no entry sign is back. I've held down the four keys and waited for the second chime but it sounds as if the system is going into sleep mode and therefore the second chime is another first one, if you know what I mean. Any more suggestions?

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