IMac PPC :: G5 Keeps Losing Its WiFi Connection?

Jun 28, 2012

I have 3 macs working off my wireless router.  Two out of three are still working fine, but the third (an iMac G5) keeps losing its network connection and either won't find the network or, if it does, will not allow me to rejoin it, even after entering the relevant key/password. It has been in the same location in my house and has worked fine for the last five years.  But oddly, if I move the G5 to within a few feet of the router it starts working again (though sometimes seems unable to find the network, although when it does it will let me join it, hassle free). 

Have spoken to some Apple guys and, following their advice, have gone into SYSTEM PREFERENCES, NETWORK, LOCATION but having got that far a pop-up appears telling me that an application has changed my network settings.  Zapping OK, this dialog box just keeps re-appearing and the only way I can get out of this corner is by 'force quit'.  

Info:
iMac, Mac OS X (10.4.11)

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