Purchased Macbook Used, Security Concerns

Hi.
I purchased a macbook used just so I could have an alternate OS and Ubuntu is no longer a choice because of adobe dropping flash support.
This macbook has I think 10.8.6 OS installed.
Basically the person didn't restore it to factory settings, rather just setup a prompt for a new user which I filled out.
Are there any security concerns I should be aware of? I actually don't intend to do any shopping or anything like that, not even email.
What happened the other day, was that my brother I think logged in to some game or something, and macbook found his phone. That got me surprised a little bit, so I was kind of worried what might happen.
Any thoughts?
B.T.W. if I chose to reinstall why do I have to put in registration information, name, address, etc?

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US purchased Macbook using AEBS in UK

Hi guys,
I purchased my Macbook pro(month ago) in the US,and have my AEBS set up and working(nowhere near what i expect though,like others in other threads).
I have all of the options in Airport Utility that the US version of the Utility has(although downloaded the software from UK purchased AEBS) including N-5GHZ.
I wondered firstly,whether that makes 5GHZ available to me( i know that we over here aren't supposed to use 5GHZ).I tried that option and still the speeds are very poor.
Secoondly,should,or could there be any issue with the fat that the Macbook Pro is a US machine,and the AEBS is UK? I wouldn't have thought so but maybe some of the more experienced Mac heads on here could add a comment.
In any event,although it is up and running(im actually using my G network because it is quicker! and i'm sure im not the only one),i am disappointed that it isn't giving the speed or range boost i was hoping for.
P.S Apple support here in the UK is excellent and has spent hours going through various issues(mainly down to my ignorance).However i did notice that on the day i called after buying the AEBS,the poor guys at Apple didn't have an AEBS as a reference,so were helping me effectively "blind"
Just makes me wonder whether Apple may have rolled the AEBS out a little early????

hi michael,
thanks much. it works now.
the base was set to automatic (channel 13).
i rebooted the airport express base station. i had done that before. however this time i also unplugged my wireless landlandline phone base station. that seems to have done the job.
i think channel 13 is one of those european channels not available on a n. american wireless card.
works fine now. thanks for your help.
john

HT1338 Purchased a used macbook pro with Mountain Lion. My old Mac runs Snow Leopard is backed up to Time machine. How do I register the operating system to me and how do I use Time Machine to move my files to the new used computer?

Purchased a used macbook pro with Mountain Lion. My old Mac runs Snow Leopard is backed up to Time machine. How do I register the operating system to me and how do I use Time Machine to move my files to the new used computer?

If you look at the User Tips tab, you will find a write up on just this subject:
https://discussions.apple.com/docs/DOC-4053
The subject of buying/selling a Mac is quite complicated. Here is a guide to the steps involved. It is from the Seller's point of view, but easily read the other way too:
SELLING A MAC A
Internet Recovery, and Transferability of OS & iLife Apps
Selling an Old Mac:
• When selling an old Mac, the only OS that is legally transferable is the one that came preinstalled when the Mac was new. Selling a Mac with an upgraded OS isn't doing the new owner any favors. Attempting to do so will only result in headaches since the upgraded OS can't be registered by the new owner. If a clean install becomes necessary, they won't be able to do so and will be forced to install the original OS via Internet Recovery. Best to simply erase the drive and revert back to the original OS prior to selling any Mac.
• Additionally, upgrading the OS on a Mac you intend to sell means that you are leaving personally identifiable information on the Mac since the only way to upgrade the OS involves using your own AppleID to download the upgrade from the App Store. So there will be traces of your info and user account left behind. Again, best to erase the drive and revert to the original OS via Internet Recovery.
Internet Recovery:
• In the event that the OS has been upgraded to a newer version (i.e. Lion to Mountain Lion), Internet Recovery will offer the version of the OS that originally came with the Mac. So while booting to the Recovery Disk will show Mountain Lion as available for reinstall since that is the current version running, Internet Recovery, on the other hand, will only show Lion available since that was the OS shipped with that particular Mac.
• Though the Mac came with a particular version of Mac OS X, it appears that, when Internet Recovery is invoked, the most recent update of that version may be applied. (i.e. if the Mac originally came with 10.7.3, Internet Recovery may install a more recent update like 10.7.5)
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• Once Accepted on the new Mac, the iLife apps can not be transferred to any future owner when the Mac is sold. Attempting to use an AppleID after the apps have already been accepted using a different AppleID will result in the App Store reporting "These apps were already assigned to another Apple ID".
• It appears, however, that the iLife Apps do not automatically go to the first owner of the Mac. It's quite possible that the original owner, either by choice or neglect, never Accepted the iLife apps in the App Store. As a result, a future owner of the Mac may be able to successfully Accept the apps and retain them for themselves using their own AppleID. Bottom Line: Whoever Accepts the iLife apps first gets to keep them.
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Follow these instructions step by step to prepare a Mac for sale:
Step One - Back up your data:
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1. Open Carbon Copy Cloner.
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Destination means a freshly erased external backup drive. Source means the internal
startup drive.
Step Two - Prepare the machine for the new buyer:
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2, Remove any Open Firmware passwords or Firmware passwords.
3. Turn the brightness full up and volume nearly so.
4. Turn off File Vault, if enabled.
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5. Click on the Erase button and wait until the process has completed.
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7. Select Reinstall Lion/Mountain Lion and click on the Install button.
8. Upon completion shutdown the computer.
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Message was edited by: Ravindra Holalkere

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Esteban1015 wrote:
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Purchased Macbook Used, Security Concerns

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