macbook being silly !!! help please .

  wearenotnumbers 19:46 04 Dec 2016

I have a macbook pro late 2008 15inch and it is playing up for some reason .it won't let me use the camera or the microphone on face book chat ,nor on another site ,and small strange things keep happening like changing colours on my preference of colour for the screen surrounds ,I tried to reset the PRAM ,and I don't know if the reset worked but nothing has changed ,any help would be really appreciated thank you

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