Not used my G5 Powermac (late 2004) for ages. Only boots in with Installation disk, but colour dots on white screen and message comes up to reboot machine. Nothing happens.

Not used my G5 Powermac (late 2004) for  about 2 years. Was going to set it up for the lads to do school work.
However it only boots in with Installation disk, but colour dots on white screen and message comes up to reboot machine. However nothing happens apart from me keep trying. Also the numerous fans get louder and louder and louder.....
Any ideas folks

Can you please provide details on the exact model?
For a start, the PRAM battery is likely dead.  PRAM tells the computer which drive to start with, other basic information.  Still, you can usually get the computer to start, though bad PRAM is unpredictable and could be stopping that.
Some computer models use software to control cooling fans.  If there's no software commands they automatically go into high speed to prevent overheating.  Your software obviously isn't loading, so runaway fans.

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