I want change a couple of standart cheap rubber dome keyboard keys with cherry mx switches, but now I wounder if it's even possible?
I would open up all parts of the printer and clean the rubber rollers with a very small amount of rubbing alcohol. It will help prevent future paper jams. As for why it currently isn't working, turning it off and turning it back on may clear any errors up. If that doesn't work, open all the doors/compartments on the printer and make sure nothing else is jammed. It will also clear the sensors that detect those paper jams.
I've had multiple bikes stolen. Alarms don't mean anything, trust me. I've had them locked up with heavy chains/kevlar shielded cables, wheel locks, chained to concrete posts, etc. Bikes are the easiest thing to steal. Takes two guys about 10 seconds to lift it inside of a cargo van and be gone. It will be stripped and dumped within hours long before any lojack type system can track. Get full coverage insurance if it's a nice bike and use your judgement about where you leave it. Try to keep it in a garage if possible. If you must lock it up in a carport or outside use a bike cover with a lock (so they can't see what's underneath). It attracts less attention. Same thing for a moped. One person can pick it up and run away with it.
