I have a original Macbook, which I bought second hand last year, up until recently it had been working fine, I had had to upgrade the ram to 4gb and buy a new battery but had no other issues. Recently when I have turned my Macbook on it boots up fine however it is completely unresponsive after loading everything for several minutes. I can move the mouse around the screen but cannot selective anything with the cursor nor do any of the function keys or keyboard shortcuts work. After several minutes however everything works fine, this is rather inconvenient as I would prefer to not have to wait five minutes after turning my Macbook on before I can use it.

I was wondering what might cause this temporary unresponsiveness and if there was a way I could fix the problem?