I changed my iCloud password on my Mac and now my iPhone and iPad keep automatically reverting to the old password which is no longer valid.  What should I do?

I changed my password for iCloud on my Mac, but my iPhone and iPad keep reverting back to the old password which no longer works.  I cannot iMessage or purchase anything from iTunes. 

Hello, on the Date...
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/ 
Have you blown the dust out lately, especially the Graphic Card & PSU?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
If you have any temps in the 70°C/160°F range, that's likely it.

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