G5 won't restart goes into hi fan mode

I have an older Powermac Dual G5
when I restart the screen stays black and the computer goes into Hi Fan mode and never comer out
If I crash it our pull the power plug and let set for a few min it will bootup if i tell it to restart agin same
same problem all over again also if itell it to shut down if won't have to hold power button in to crash it
OS 10.5.8 4gigs of ram
Thanks for any help

Hello,
Sounds a bit like a bad Capacitor somewhere... if shutdown, & unplugged from power for a bit, does it then startup fine the first time you try?
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...
See which one your G5 has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/

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G5 won't restart goes into hi fan mode

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