First thing you have to check is if there is power going to the DW - If you do not have a socket tester try plugging something else into the DW socket that you know works. If you prove the socket is working the next thing to check would be the fuse in the plug of the DW. Again if you do not have a device to check the fuse - swap for one you know is working (13amp usually).
testing components becomes a bit more complicated after this !
you said you checked "fuse box" of apartment - not the actual socket / appliance power ???