Hey I'm a new Mac user (1 week old 
) and my Mac when I first boot or load programs or load some web pages my iMac 17" makes a weird clicking/grinding noise. I've heard other computers do this but my five year old Dell Pc dosn't even do that. Just wondering if it's normal or if theres something wrong.
Thanks
	
		
			
		
		
	
				
			Thanks