Apple Imac 21 5inch Late 2011 User Guide

51
Chapter 4      Problem, Meet Solution
Important:  Instructions	that	refer	to	modems	do	not	apply	to	LAN	users. 	LAN	users	
might	have	hubs, 	switches,	routers,	or	connection	pods	that	cable	and	DSL	modem	
users	do	not	have. 	LAN	users	should	contact	their	network	administrator	rather	than	
an	ISP.
PPPoE Connections 
If	you	are	unable	to	connect	to	your	ISP	using	PPPoE	(Point	to	Point	Protocol	over	
Ethernet), 	make	sure	you	entered	the	correct	information	in	Network	preferences. 	
To enter PPPoE...

52Chapter 4      Problem, Meet Solution
Network Connections
Make	sure	the	Ethernet	cable	is	plugged	into	your	iMac	and	into	the	network. 	
Check	the	cables	and	power	supplies	to	your	Ethernet	hubs	and	routers.
If	you	have	two	or	more	computers	sharing	an	Internet	connection, 	be	sure	that	your	
network	is	set	up	properly. 	You	need	to	know	whether	your	ISP	provides	only	one	IP	
address	or	multiple	IP	addresses, 	one	for	each	computer.
If	only	one	IP	address	is	provided, 	then	you	must	have	a	router...

53
Chapter 4      Problem, Meet Solution
Problems with Wireless Communication
If	you	have	trouble	using	wireless	communication:
	
ÂMake	sure	the	computer	or	network	you	are	trying	to	connect	to	is	running	and	has	a	
wireless	access	point.
	
ÂMake	sure	you’ve	properly	configured	the	software	according	to	the	instructions	that	
came	with	your	base	station	or	access	point.
	
ÂMake	sure	your	iMac	is	within	antenna	range	of	the	other	computer	or	the	network’s	
access	point. 	Nearby	electronic	devices	or	metal...

54Chapter 4      Problem, Meet Solution
You	can	find	the	latest	information	about	Mac	OS	X	at	www.apple.com/macosx.
If	you 	have 	a 	problem 	with 	software 	from 	a 	manufacturer 	other 	than 	Apple, 	contact 	the	
manufacturer. 	Software 	manufacturers 	often 	provide 	software 	updates 	on 	their 	websites. 	
Learning More, Service, and Support
Your	iMac	does	not	have	any	user-serviceable	parts, 	except	the	memory.	If	you	need	
service, 	contact	Apple	or	take	your	iMac	to	an	Apple	Authorized	Service...

55
Chapter 4      Problem, Meet Solution
AppleCare Service and Support
Your	iMac	comes	with	90	days	of	technical	support	and	one	year	of	hardware	repair	
warranty	coverage	at	an	Apple	Retail	Store	or	an	Apple-authorized	repair	center, 	such	
as	an	Apple	Authorized	Service	Provider. 	You	can	extend	your	coverage	by	purchasing	
the	AppleCare	Protection	Plan. 	For	information,	visit	www.apple.com/support/products	
or	visit	the	website	address	for	your	country	listed	below.
If	you	need	assistance, 	AppleCare...

56Chapter 4      Problem, Meet Solution
Locating Your Product Serial Number
Use	any	of	these	methods	to	find	the	serial	number	of	your	iMac:
	
ÂChoose	Apple	()	>	About	 This	Mac.	Click	the	version	number	beneath	the	words	
“Mac	OS	X” 	to	cycle	through	the	Mac	OS	X	version	number, 	the	build	version,	and	the	
serial	number.
	
ÂChoose	Apple	()	>	About	 This	Mac	and	click	More	Info.
	
ÂLook	on	the	bottom	of	the	iMac	stand. 	 

Help Center       ergonomics 
www.apple.com/environment 
Last, but Not Least
5  

58Chapter 5      Last, but Not Least
For	your	safety	and	that	of	your	equipment, 	follow	these	rules	for	handling	and	
cleaning	your	iMac	and	for	working	more	comfortably. 	Keep	these	instructions	handy	
for	reference	by	you	and	others.
NOTICE:  Incorrect	storage	or	use	of	your	computer	may	void	the	manufacturer’s	
warranty.
Important Safety Information
WARNING:  Failure	to	follow	these	safety	instructions	could	result	in	fire, 	electric	shock,	
or	other	injury	or	damage.
Proper handling		Set	up	your...

59
Chapter 5      Last, but Not Least
Unplug	the	power	cord	(by	pulling	the	plug, 	not	the	cord)	and	disconnect	the	ethernet	
cable	or	phone	cord	if	any	of	the	following	conditions	exist:
	
ÂYou	want	to	add	memory
	
ÂThe	power	cord	or	plug	becomes	frayed	or	otherwise	damaged
	
ÂYou	spill	something	into	the	case
	
ÂYour	iMac	is	exposed	to	rain	or	excess	moisture
	
ÂYour	iMac	has	been	dropped	or	the	case	has	been	damaged
	
ÂYou	suspect	that	your	iMac	needs	service	or	repair
	
ÂYou	want	to	clean	the	case...

60Chapter 5      Last, but Not Least
Power specifications:
	
ÂVoltage:		100	to	240	 V	AC
	
ÂCurrent:		4	A, 	maximum
	
ÂFrequency:		50	to	60	Hz
Hearing damage		Permanent	hearing	loss	may	occur	if	earbuds	or	headphones	are	
used	at	high	volume. 	Set	the	volume	to	a	safe	level. 	You	can	adapt	over	time	to	a	
higher	volume	of	sound	that	may	sound	normal	but	can	be	damaging	to	your	hearing. 	
If	you	experience	ringing	in	your	ears	or	muffled	speech, 	stop	listening	and	have	your	
hearing	checked. 	The	louder...