lilpig88, I am not familiar with a TS 110 other than being a 90 hp tractor. With respect to safety switches; in addition to the above suggestions, provided you have physically eye balled the battery fluid level and charge, checked and cleaned battery connection at the battery posts and frame as well as starter; most tractors that size have a pto, clutch, operator presence (seat) safety switches. The seat and clutch safety switches should be in close proximity to (under the seat) (in the vicinity of clutch pedal) . Does your TS110 have the 16F-4R or 24F-24R transmission? Safety switches and locations may vary depending upon with trans you have. Have you talked to the dealer about this yet? Sounds to me like now would be a great time to buy a shop manual for your machine. The usual method of test for a bad safety switch is to unplug the switch coupling plug and jumper the harness side of the plug going back to the tractor. This should simulate the safety switch being disabled. Again, a shop manual or a few pointers from your dealer shop could better clarify this.
Certainly not attempting to insult your intelligence but I have done the same thing before too

...................I take it you have checked to ensure the pto is disengaged and all of the safety switches are plugged in? (could have snagged on something while working the tractor and it got pulled apart or broken wire)
Anyhow, this is my best stab at this problem as I am not familiar with this machine. I have worked on TW-20 my father used to have, but nothing this new. Good luck on finding the problem and be sure to let us know what you found. :thumbsup:
And by the way........Welcome to Tractor forum! :friends: :cheers: