Hi all,
Basically I dont have a clue about computers but I knows theres definitely something up with mine... Whats happened is my computer started freezing a lot and I had to keep shutting it down incorrectly, I got the blue screen (tht says windows had to shut itself down) a few times. It seemed to be after I put in an external hard drive which wasnt working properly, but when I took the drive to be checked they said it was fine so not sure if its coincidence.
Since then its started making clicking noises, occasionally OPENING about a BILLION more of an internet page I open, the VOLUME control keeps turning itself right down and the weirdest thing is I keep hearing from nowhere SOUND from an advert, same one every time (and while on youtube the other day also HEARD a snippet of random music that didnt seem to be from anywhere either.) So now I'm just trying to figure out exactly what it is I'm dealing with, if anyone can help me find an answer I'd be so grateful!

(I've got windows XP, if thats important at all?)Sounds to me like a failing hard drive.
Backup what's important immediately before it's too late...You said you have an external hard drive that you connected to your computer... What about your previous hard drive? When you say external hard drive, is it a portable external hard drive? It may be a hardware or software issue.