How do i delete and clean my iMac so i can give it to my sister?

I need to delete files and clean them so i can give my imac to my sister. want to keep the operting system

These articles and webpages explain how to restore the Mac to it's factory condition before selling of giving away:
What to do before selling or giving away your Mac
Selling your old Mac? Prepare it first - CNET
Preparing an old Mac for sale | Macworld
OT

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Slow imac, how to check status and clean up disc?

slow imac, how to check status and clean up disc?

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

How do I delete and old iCloud acct

how do I delete and old iCloud acct from an iMac running OS X Mavericks 10.9.3. I have established a new iCloud acct but in iCloud preferences it keeps asking for the password for the old acct which is inactive now and I can't access the new account.

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How do I check and clean of virus's

How would I check and clean my Mac of virus's?

1. This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files. This feature is transparent to the user, but internally Apple calls it "XProtect." The recognition database is automatically updated once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders. In most cases, there’s no benefit from any other automated protection against malware.
The following caveats apply to XProtect:
It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets (see below.)
It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
3. Starting with OS X 10.7.5, there has been another layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't actually been tested by Apple (unless it comes from the Mac App Store), but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. For most practical purposes, applications recognized by Gatekeeper as signed can be considered safe.
Gatekeeper has, however, the same limitations as XProtect, and in addition the following:
It can easily be disabled or overridden by the user.
A malware attacker could conceivably get control of a code-signing certificate under false pretenses (though there's no evidence this has happened yet.) The certificate would eventually be revoked, but probably not before some damage was done.
For more information about Gatekeeper, see this Apple Support article. 4. Considering all the above, the best defense against malware is your own intelligence. All known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "trojan horses," which can only have an effect if the victim is duped into running them. If you're smarter than the malware attacker thinks you are, you won't be duped. That means, primarily, that you never install software from an untrustworthy source. How do you know whether a source is trustworthy?
Any website that prompts you to install a “codec,” “plug-in,” or “certificate” that comes from that same site, or an unknown one, is untrustworthy.
A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn users who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
“Cracked” copies of commercial software downloaded from a bittorrent are likely to be infected.
Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. No intermediary is acceptable.
5. Java on the network (not to be confused with JavaScript, to which it's not related) is a weak point in the security of any operating system. If a Java web plugin is not installed, don't install one unless you really need it. If it is installed, you should disable it (not JavaScript) in your web browsers. Few websites have Java content nowadays, so you won’t be missing much. This setting is mandatory in OS X 10.5.8 or earlier, because Java in those obsolete versions has known security flaws that make it unsafe to use on the Internet. The flaws will never be fixed. Regardless of version, experience has shown that Java can never be fully trusted, even if no vulnerabilities are publicly known at the moment.
Follow these guidelines, and you’ll be as safe from malware as you can reasonably be.
6. Never install any commercial "anti-virus" or "Internet security" products for the Mac, as they all do more harm than good. If you need to be able to detect Windows malware in your files, use the free software ClamXav — nothing else.
Why shouldn't you use commercial "anti-virus" products?
Their design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere.
In order to meet that nonexistent threat, the software duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability and poor performance.
By modifying the system, the software itself may create weaknesses that could be exploited by malware attackers.
7. ClamXav doesn't have these drawbacks. That doesn't mean it's entirely safe. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so can corrupt the Mail database. The messages should be deleted from within the Mail application.
ClamXav is not needed, and should not be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware. If you don't need to do that, avoid it. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
8. The greatest danger posed by anti-virus software, in my opinion, is its effect on human behavior. When people install such software, which does little or nothing to protect them from emerging threats, they get a false sense of security from it, and then they may do things that make them more vulnerable. Nothing can lessen the need for safe computing practices.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use.

How do I delete and Apple ID ? I had a friend transfer all my stuff from his computer and I go to update or download apps his ID pops up and asks for his password instead of mine! Ugh so frustrated right now

How do I delete and Apple ID ? I had a friend transfer all my stuff from one phone to another using his computer. I can't update or download apps, his ID pops up and asks for his password instead of mine! Ugh so frustrated right now!

You can't delete an Apple ID. Furthermore, everything you transferred is tied permanently to your friend's Apple ID. You do not legally own that software. If you want that software for yourself, then you need to purchase it using your Apple ID.

How do I delete and existing itunes account on my iphone and start a new account

how do I delete and existing itunes account on a phone that i have transfered to and start a new one

You can't. All you can do is stop using it. Anything you have purchased using the old Apple ID is permanently connected to it and cannot be updated or re-downloaded when using the new Apple ID.

My battery life decreased dramatically after updating to ios 6.1.2. How do I delete and go back to previous iso?

I have iphone 5; my battery life decreased dramatically after updating to ios 6.1.2. How do I delete and go back to previous iso?

Downgrading the iOS isn't supported and wouldn't help even if you could. There have been reports of decreased battery life after every update since iOS 1.0.1.
There are lots of things that can be done including reinstalling push email accounts. basic phone reset (pressing both home and power buttons for at least 10 seconds until the Apple logo appears), and restoring the phone with and without a backup.

On iTunes 11.0, how do I delete and App from iTunes? I tried selecting the App to be deleted and pressing Delete, but that did not work.

On iTunes 11.0, how do I delete and App from iTunes? I tried selecting the App to be deleted and pressing Delete, but that did not work.
MoragaTom

I have the same problem on my iPhone - an app I want to delete but can't. The app in question doesn't show up on the list of apps i iTunes and doesn't show an 'X' when it starts to wiggle. All the other apps do, but not this one. It's definitely an app. How do I get rid of it, please?

I have entered a incorrect email address, so cannot update an app I purchased. The email does not exist. How do I delete and use my primary Apple ID

I have used an incorrect email address for my Apple ID when I punched an App. Cannot get updates. How do I delete and use my primary account email address?

Delete and redownload that application when signed into the correct Apple ID. This may require repurchasing it.
(127051)

How do you delete and app like big fish?

how do you delete and app like big fish? I did not want the game but the manager is still on my computer.....I want to delete it. Is their a way to do that. because it doesn't have an uninstall.

Drag it to the trash from your Applications folder.

Got a iphone set the apple id n it was the wrong email address now i can't verifie it how do i delete and start over

got a iphone set the apple id n it was the wrong email address now i can't verifie it how do i delete and start over

Welcome to the Apple Community.
In order to change your Apple ID or password for your iCloud account on your iOS device, you need to delete the account from your iOS device first, then add it back using your updated details. (Settings > iCloud, scroll down and hit "Delete Account")
When you delete your account, all the data that is synced with iCloud will also be deleted from the device (but not from iCloud), but will be synced back to your device when you login again.

HT1277 My hard drive crashed and using my back up, it seems my Mac mail is corrupted. How do I delete and start over?

My hard drive crashed and using my back up, it seems my Mac mail is corrupted. How do I delete and start over?

If you are a resident of the U.S., have iTunes 10.3 or later, you can re download purchases for free.
Downloading past purchases from the App Store, iBookstore, and iTunes Store

How do you delete an app on iMac

How do you delete an app on iMac? I have no problem deleting them on an iPad or iPhone, but the iMac does not have the touch screen. I've tried putting them in the trash, but they won't go away.

Hi...
Great little utility you can use to delete not just the app but all the associated files.
Click here > Download AppCleaner for Mac - Uninstall your apps easily. MacUpdate.com

HT1535 I have "Camera roll" and "Photo Stream" - effectively storing my photo's twice - how do I delete and which one do I delete?

I have "Camera roll" and "Photo Stream" - effectively storing my photo's twice - how do I delete and which one do I delete?

your photos are in events -
the most common cause of not seeing the events is bad camera dates or event sort being wrong so you are looking in the wrong place - see the view menu ==> sort events to correct sort - if the camera date is off select a photo and right click and show event to find it - then use the adjust time and date command to correct it
and you can drag photos to the desktop - what happens when you do? probably a better work flow with more flexibility is to select the photo(c) and export them (file menu ==> expoprt) to a desktop folder
LN

TS3899 On a 5C, how do I delete and trash emails to where they remain deleted? Every time I check emails it gives me the prior day's too even though they've already been dumped. Highly annoying!

On a 5C, how do I delete and trash emails to where they remain deleted? Every time I check emails it gives me the prior day's too even though they've already been dumped. Highly annoying!

Settings/Mail,contacts,calendars. Tap on the name of the account. Tap Advanced. Tap Remove after one day.
Also, do not try to read or delete messages while they are downloading. Wait until they finish and the phone beeps to confirm. If you delete messages before the mail retrieval session finishes they will not be removed from the server.

How do i delete and clean my iMac so i can give it to my sister?

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