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Hello, for future reference CLICK HERE, that should be the manual for the thermostat...However I do need the last 4 numbers of the model number to be sure.
The thermostat gets power from the furnace/ air handler... if the breaker to that that is off, then there will be no power to the thermostat... also... if the 24volt control circuit fuse or transformer blows you will have no power to the thermostat.
Tell me a lot about your technical skills and if you have a multi meter or not so I can coach you most appropriately on doing a few tests... we can go from there