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The blinking indicates a 5 minute delay.Has it been blinking more than 5 minutes?
Ok if nothing is coming on this is probably an issue with the equipment , not the thermostat. Do you have a volt meter and can you do some troubleshooting?
Do you want to try a couple of hands on troubleshooting things?
Remove front on thermostat.Disconnect the R and G wires and touch the wires together to see if indoor blower will come on
OK next connect the R and Y wires and see if outdoor will come on
May be a capacitor keeping unit from coming on. Can you open outdoor unit and locate capacitor to see if it looks swollen?
Probably about 4 screws. We can continue in the morning when it is light if that is good for you
Excellent. We will go from here. Just come back to question to continue
Talk tomorrow.Look forward to helping you.
Let me know how it looks.