Shoutbox

Alright, lately my computer has been acting very strangely. I usually turn it on when i get back from school (at around 4 pm) then shut it off in the morning (at around 7 am) ... now for some very odd reason, everytime i come back from school and turn it on, it makes a very loud freaky sound just like some car engine or something and it gets really loud at some points. I then keep shutting it off/putting it on, and only after a couple of tries (and sometimes smashing the case ) does it boot silently... :/

Now i opened up the case and checked the fan.... it looked normal, i also noticed there were two fans, one on the cpu and one facing the outside... but they both look normal... so im not sure if its even the fans...

More... once the computer does boot normally, it brings me to the setup screen and highlights "cpu speed" and tells me to set it from 2667MHZ (which is what it has always been) to MANUAL because the computer hung from an improper cpu speed, i did that.... but i still have the problem and now it goes directly to cpu external frequency (set at 133/33) and says the same error....

So what should i do? Do i change the fans? Is it some other hardware problem? Cause I checked all the manuals i had about my pc... none talk about cpu specs....