Soldato
The capacitors (i think) holds powers for hours even after it's unplugged.
Just leave it for a day before you open it up.
yeah I had the same advice with a SKY+ box...
Left it unplugged for 2 days, took the case off to remove the HDD and touched something underneath.. BANG
Burnt a hole in my finger and had a dead arm for about 3 days
happened at 3am as well, could have been lying on the floor for hours until someone found me!
OP, Bin it/get a pro in to look at it/insurance job... I wouldn't bother trying yourself unless you really know what you're doing and I betting you don't