Mac connected to working internet but unable to connect to servers 90% of time

Okay so macbook pro, bought in December.
This problem has been sporadic, happening every month or so, with the issue being that while it is connected to a working internet connection, I can't open a web browser and connect to a website.  "The connection was reset" or "Cannot connect to server" are the only error messages. App store and itunes won't connect either. If it connects, most text loads but no images.
(The reason I know the internet is working is because I am currently on a different mac with the same internet connection and it is working fine.)
Repaired permissions, emptied cache and cleared history but it didn't do anything.
Computer was working fine until an hour ago when it suddenly stopped connecting and now refuses to connect.
Did not download anything or open any programs besides firefox and photoshop which were already open.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and  Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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