it is a Canon SD30 in Tuxedo Black
i see it's an older model...
a lot of times, when a camera shows a black screen, it's a recall on the unit.
so you can send it to canon and they will fix it for free or if they don't have the parts available, they'd just
ship you a refurbished upgraded model.
i don't think urs is a recall unit, but.. if ur able to view menus and etc on ur lcd and just can't see the pics ur taking,
it's probably the power/main circuit problem.
try taking pictures anyway and look through the viewfinder.
now, if you don't hear that click sound when u press the shutter, it means that camera is definitely broken.
if ur camera continues to show black screen, i suggest that u just use it as is.
but if it doesn't take pictures at all, don't bother fixing it because repairing the camera will cost more than the price of a new camera.
cuz u might have to replace the main circuit.