Hi,
Sounds like the flood switch has activated, near the very base at the front of the machine is a black plastic panel, you need to prise this off and dry the inside with a sponge.
I fear you may have caused more problems by tipping the machine as water may have entered the electrics by doing this.
Tightening the seals will not prevent this from happening, it usually is caused by overloaded bottom trays or by using the 3-in-1 dishwasher tablets which are not advised in slimline machines
Jason
April 2009