I have a 61in. RCA Big Screen HDTV. It will not come on when you press the power button it just flashes three times.

When you say "it just flashes three time", I assume you mean the power indicator? What type of "big screen" is this? Model number helps most?

If it is a rear projection TV, chances are the lamp just needs to be replaced, but without full diagnostics I cannot be 100% sure. You will likely need to have someone come out to take a look at the TV to fully define what is wrong. In-home calls usually range around $100-150.

Another option is to call RCA or look up the manual to see if it gives you a specific explanation as to what the three flashes mean. Check the back of the manual in the troubleshooting area.