Here is the allowed Luggage limit

Check
RULES FOR LUGGAGEfor the details.
1. Always keep the original bill (if possible) for the computer when travelling.
2. Know the weight restrictions of the compartment/class you will be travelling in.
3. Weigh you system in the luggage counter and get the receipt by paying a small fee. This will be the proof for the weight of your computer and hence TT cannot claim the weight is above limit.
Keep these three in mind and you wont getinto trouble .