Apple Imac 21 5inch Late 2011 User Guide

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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 settings:
1  Choose	Apple	()	>	System	Preferences.
2  Click	Network.
3  Click	Add	(+)	at	the	bottom	of	the	network	connection	services	list, 	and	choose	PPPoE	
from	the	Interface	pop-up	menu.
4  Choose	an	interface	for	the	PPPoE	service	from	the	Ethernet	pop-up	menu. 	
Choose	Ethernet	if	you	are	connecting	to	a	wired	network, 	or	Wi-Fi	if	you	are	
connecting	to	a	wireless	network.
5  Click	Create.
6  Enter	the	information	you	received	from	your	service	provider, 	such	as	the	account	
name, 	password, 	and	PPPoE	service	name	(if	your	service	provider	requires	it). 	
7  Click	Apply	to	make	the	settings	active. 
						

							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	capable	of	sharing	the	
connection, 	also	known	as	network	address	translation	(NAT )	or	 “IP	masquerading.”
For	setup	information, 	check	the	documentation	provided	with	your	router	or	ask		
the	person	who	set	up	your	network. 	
An	AirPort	base	station	can	be	used	to	share	one	IP	address	among	multiple	
computers. 	For	information	about	using	an	AirPort	base	station, 	see	Help	Center		
(click	Help	in	the	menu	bar	and	search	for	 “airport”)	or	visit	the	AirPort	website	at		
www.apple.com/support/airport.
If 	you 	can’t 	resolve 	the 	issue 	using 	these 	steps, 	contact 	your 	ISP 	or 	network 	administrator. 
						

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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	structures	can	interfere	with	wireless	
communication	and	reduce	this	range. 	Repositioning	or	rotating	your	iMac	might	
improve	reception.
	
ÂCheck	the	 Wi-Fi	status	menu	(Z)	in	the	menu	bar. 	Up	to	four	bars	appear,	indicating	
signal	strength. 	If	the	signal	strength	is	weak, 	try	changing	your	location.
	
ÂSee	Help	Center	(click	Help	in	the	menu	bar	and	search	for	 “wi-fi”).	Also	see	the	
instructions	that	came	with	the	wireless	device	for	more	information.
Keeping Your Software Up to Date
When	you’re	connected	to	the	Internet, 	Software	Update	checks	periodically	to	see	
if	updates	are	available	for	your	computer. 	You	can	download	and	install	these	free	
software	versions, 	drivers,	and	other	enhancements	from	Apple. 	
You	can	set	how	frequently	your	iMac	checks	for	updates	in	Software	Update	
preferences. 	To	check	manually, 	choose	Apple	()	>	Software	Update.
For	more	information	about	Software	Update, 	see	Help	Center	(click	Help	in	the	menu	
bar	and	search	for	 “Software	Update”). 	 
						

							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	Provider. 	You	
can	find	more	information	about	your	iMac	through	online	resources, 	Help	Center,	
System	Information, 	or	Apple	Hardware	 Test.
Online Resources
For	online	service	and	support	information, 	go	to	www.apple.com/support.	You	can	
search	the	AppleCare	Knowledge	Base, 	check	for	software	updates,	or	get	help	on	
Apple’s	discussion	forums.
Help Center
You 	can 	often 	find 	answers 	to 	your 	questions, 	as 	well 	as 	instructions 	and 	troubleshooting	
information, 	in 	Help 	Center 	on 	your 	iMac. 	Choose 	Help 	> 	Help 	Center.
System Information
Use	System	Information	to	see	what	hardware	and	software	is	on	your	iMac, 	the	serial	
number	and	operating	system	version, 	how	much	memory	is	installed,	and	more.	To	
open	System	Information, 	choose	Apple	()	>	About	 This	Mac	from	the	menu	bar	and	
then	click	More	Info. 
						

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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	telephone	support	representatives	can	help	you	with	
installing	and	opening	applications, 	and	basic	troubleshooting.	Call	the	support	center	
number	nearest	you	(the	first	90	days	are	complimentary). 	Have	the	purchase	date	and	
your	iMac	serial	number	ready	when	you	call.
Note:  Your	90	days	of	complimentary	telephone	support	begins	on	the	date	of	
purchase	and	telephone	fees	may	apply. 	
CountryPhoneWebsite
United	States 1-800-275-2273www.apple.com/support
Australia (61)	1-300-321-456www.apple.com/au/support
Canada	(English)	
														 (French) 1-800-263-3394
www.apple.com/ca/support	
www.apple.com/ca/fr/support
Ireland (353)	1850	946	191www.apple.com/ie/support
New	Zealand 00800-7666-7666www.apple.com/nz/support
United	Kingdom (44)	0844	209	0611www.apple.com/uk/support
Telephone	numbers	are	subject	to	change, 	and	local	and	national	telephone	rates		
may	apply. 	A	complete	list	is	available	on	the	web:
www.apple.com/support/contact/phone_contacts.html 
						

							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	iMac	on	a	stable	work	surface. 	Never	push	objects	into	
the	ventilation	openings. 	
Water and wet locations		Keep	your	iMac	away	from	sources	of	liquid, 	such	as	drinks,	
washbasins, 	bathtubs,	shower	stalls, 	and	so	on.	Protect	your	iMac	from	dampness	or	
wet	weather, 	such	as	rain,	snow,	and	fog.
Power		 The	only	way	to	disconnect	power	completely	is	to	unplug	the	power	cord. 	
Make	sure	you	pull	the	plug, 	not	the	cord.	Always	unplug	the	power	cord	before	
opening	your	iMac	to	install	memory. 
						

							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	(use	only	the	recommended	procedure	described	on	
page	63)
Important:  The	only	way	to	turn	off 	power	completely	is	to	unplug	the	power	cord. 	
Make	sure	at	least	one	end	of	the	power	cord	is	within	easy	reach	so	that	you	can	
unplug	your	iMac	when	you	need	to.
WARNING:  Your	AC	cord	has	a	three-wire	grounding	plug	(a	plug	that	has	a	third, 	
grounding	pin). 	This	plug	fits	only	a	grounded	AC	outlet. 	If	you	are	unable	to	
insert	the	plug	into	an	outlet	because	the	outlet	isn’t	grounded, 	contact	a	licensed	
electrician	to	replace	the	outlet	with	a	properly	grounded	outlet. 	Do	not	defeat	the	
purpose	of	the	grounding	plug. 
						

							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	the	volume, 	the	less	time	is	required	before	your	hearing	
could	be	affected. 	Hearing	experts	suggest	that	to	protect	your	hearing:
	
ÂLimit	the	amount	of	time	you	use	earbuds	or	headphones	at	high	volume.
	
ÂAvoid	turning	up	the	volume	to	block	out	noisy	surroundings. 	
	
ÂTurn	the	volume	down	if	you	can’t	hear	people	speaking	near	you.
High-risk activities		 This	computer	system	is	not	intended	for	use	in	the	operation	
of	nuclear	facilities, 	aircraft	navigation	or	communications	systems, 	air	traffic	control	
systems, 	or	for	any	other	uses	where	the	failure	of	the	computer	system	could	lead	to	
death, 	personal	injury, 	or	severe	environmental	damage.