Computer Problems - PLEASE READ

Well there could be a few problems. Now you say that there is no Video? And no apparent sound.

Now what would be the (most sensible thing to do) would be to Check your video card... With the power showing on the monitor, and the power is still on? Check your video card and make sure it is seated tightly. (push it in) . (Since you have moved it recently you may have bumped something or set it down too fast , this can cause it to come loose).

Now after checking the video card for it being in properly, Is there ANY video at all when you turn the computer on? If so your monitor is getting malsufficient power. (Instead of listening to the idiot newb kockblocker try finding an extra power cable and swap it out with your current monitor cable.)

Try the video card thing and see if it works.

from what i have read in some computer repair books it is very possilbe like kockblocker1 said that your power supply is going bad. also like titusfied said if your lights just recently burnt out you could have had either a power surge to blow the light or you may not even be gettin enough power to power your lights. the drop in power would also cause your fans to spin slower, hence making a different sound.

Well if your light blew out then you may not have removed the power cable that was running to it correctly. I mean if its running power to (nothing) then that could short something out, or just drain too much power and kill something..

Oh yeah, and tidus, what 'computer repair books' have you read? :-\//