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Hi, welcome to justanswer.com! My name is Mike.
I will need some information before we begin:
Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information:The exact system Version (listed right under OS X ??)ProcessorMemory
Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. If you can't get to that menu just hold the power button for 10 seconds until it shuts down. Then start it up again holding those keys. When you see the Apple Logo you can let go.
When the machine boots you may have to choose your language then you will see the OS X Utilities screen. Select the Disk Utility and then Continue. Then in Disk Utility select Macintosh HD in the left column (if there are two with that name or it is named something else choose the first indented item) and then on the right select the First Aid tab then select Run. If all is ok restart then Go here and run the speedtest and give me the results here: speedtest.net
Hello!! did you try that?
Do you still need help or not?