IMac PPC :: Making Noise And Blacking Out

Apr 11, 2012

My iMac 20" G5 (PPC, working with Tiger 10.4.11), bought in April 2006, has the following illness: 

When I work locally, it functions fine. When I go into Internet, it starts purring and whining. 

When I watch a video on YouTube, for example, the purring and whining increases and finally the screen blacks out. With a mouse click, the screen comes back but goes out again immediately. 

After shutting down the system and giving it some rest, everything starts working again normally, but only until I go online. 

I have tried to use Disk Utility, but the install disk that came with my Mac gets ejected. 

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