well, the hissing noise is still there! (UNFORTUNATLY) but ive been on the phone to apple, spoke to some guy (WHO WAS AN IDIOT, "turn the computer off, turn the computer on")
yea i know sometimes a simple restart can cure most things!
so, anyway, on the phone to apple, they couldnt work it out, luckily im within the replacement period so there sending me out a new one, i dont know how much im into the replacment period, must be on the day its pretty close to the wire.
spoke to the sales department and their sending me a new one, got the confirmation of it, hope it wont take long i need it for work. At the moment im abit sketched out about the whole thing, ive never had to send anything back, but i do commend apple for being nice about the situation and giving me a new replacement, fingers crossed this new one will be the perfect computer i had up until yesterday!!!