This sounds like your power supply has become unplugged or has died. This
is a common problem. You can put a meter on the power leads to check if you
have the correct 12 and 5 volt output but if nothing is working including
the fan then a dead power supply is most likely the problem.
Power supplies are readily available...you will need to get one that  fits
your particular case..Dalco is one place that sells them http://www.dalco.com/

Mark


>2. My computer has been down unecpectedly. I has no idea why it is down.
>Nothing appears on the monitor but the monitor light - no powerlight, turbo
>led, turbo number... work on the case. I don't hear even the sound
>tac..tac..tactactac... of the quantum hdd as usual.The monitor cable is
>sure connect to the VGA card and monitor power supply is plugged into the
>case.
> what should i do? will I have to get a new case or somethings else?
>Thank you for reading my mails
> - Nguyen Minh Luan -
>