my computer wont work, monitor is a adc an tower is a superwritemaster ?

my computer screan wont turn on it just says no signal input or cable disconection, but all my cables are in... Ive tried switching the tower cable with the monitor cable and thats not working an i dont no what else to do. The monitors make is a adc, an the tower is a super writemaster. Ive enen tried the reset button but thats not changing anything either..

lucy
October 2010