MacBook Air won't load some websites

Hi,
I've been having this issue with my new MacBook Air since I bought it a month ago and I still don't know what to do.
I'm using Safari as the main browser and I connect to the Wi-Fi network at home. It's strange, but it happens very often that I simply can't access websites like Facebook, Google, YouTube etc. on it or any other browser (I tried Mozilla, Chrome), while for example my sister with her Windows (w/Google Chrome) notebook loads these websites perfectly when we're in the same room. It is also strange because when I simply turn the wifi off on my mac and leave the browser open, the page will load itself immediately. (Of course I can't use it because I'm no longer connected to the internet...)
Can you help me with this? I believe this is a software glitch since all other (Windows) computers in my family can load the websites while using the same browser and the same network at home.
Any help is appreciated.
Thank you very much,
J.

A new Mac comes with 90 days of free tech support from AppleCare.
AppleCare: 1-800-275-2273
Call AppleCare.
They will be help you to resolve the issue.
Best.

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MacBook Air won't load ONE website - my own

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You, or someone using your computer, hacked the system to redirect certain servers. The file modified is /etc/hosts.
The easiest way to fix the hosts file is to restore it from a backup that predates the modification, or to copy the unmodified file from another Mac. If you can't do that, then do as below. Please read this whole message before doing anything.
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If you have more than one user account, you must be logged in as an administrator. I've tested these instructions only with the Safari web browser. If you use another browser, they may not work as described.
Triple-click anywhere in the line below on this page to select it:
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Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
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# Host Database
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
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255.255.255.255          broadcasthost
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sudo sed -i~ '11,$d' /etc/hosts
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If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator. Log in as one and start over.
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OS X already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple.
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Firefox has been working good until now. It started acting weird after a pop up came up saying something like "Start Firefox in safe mode or Reset Firefox" I misread reset as restart and clicked that and now sites like Gmail, Kongregate, and Bing won't load. I uninstalled Firefox then reinstalled it, I restarted my computer, I did a system restore, and I used safe mode on my computer still nothing. What is wrong? How can I fix this?

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In what way started Firefox to act weird?
*http://kb.mozillazine.org/Browser_will_not_start_up
*http://kb.mozillazine.org/Error_loading_websites
Do a malware check with some malware scanning programs on the Windows computer.<br />
You need to scan with all programs because each program detects different malware.<br />
Make sure that you update each program to get the latest version of their databases before doing a scan.
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
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*http://support.kaspersky.com/viruses/solutions?qid=208280684
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
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Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

What to do when my Macbook air won't load from startup. It hangs in the middle during the black apple screen at the beginning

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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
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Step 1
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If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
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Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
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Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
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If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
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Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
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Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
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d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
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If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
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Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

Unable to load some websites after an update to IOS6

I am unable to load some websites in both Safari and Google Chrome. This did not bother me until I found at that I cannot access some websites I can access before and frequent. I am unsure if this was caused by the update to ios6, but this incident only happened after the update. I am unsure as well if this is related to the problem of me unable to connect to itunes and app store after the update. I've fixed those by changing my DNS to 8.8.8.8 and changing the time trick. I've also noticed that twitter and some apps crashed a lot. I have no problem connecting to the wifi though. Thank you in advance.

Some additional details I have also noticed. Some images will not show or appears as a blue and white question mark in some websites. Even here in apple website.

HT204053 i have an itunes library with 1,000+ songs on a pc. my daughter has a macbook air and i loaded my apple ID onto it. how do i get the songs from my itunes account to show up? This works fine on her iPhone, but having trouble on the new macbook

i have an itunes library with 1,000+ songs on a pc. my daughter has a macbook air and i loaded my apple ID onto it. how do i get the songs from my itunes account to show up? This works fine on her iPhone, but having trouble on the new macbook air

Hey kbert73
I would do a transfer of purchases from the phone and not sync. If you sync then it will want to start over and sync music that is on the MacBook Pro. If you want to transfer the music, check out the article below that will give you multiple options on how to move. I have also provided on how to sync with multiple computers.
iTunes: How to move your music to a new computer
http://support.apple.com/kb/ht4527
Using iPhone, iPad, or iPod with multiple computers
http://support.apple.com/kb/ht1202
Thanks for using Apple Support Communities.
Regards,
-Norm G.

MacBook Air won't load some websites

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