Everytime i turn it on the w symbol appears then the screen goes black

Okay this is a power issue, depending on the model of your unit what you may need to replace is ether the power board or just the inverter board. On some of the Westinhouse models the power board and the inverter board are on the same board which is called the LIPS board but this agan is only in some models. What I would recommend doing is to contact the Westinghouse parts department at [email protected] for some further information, you will need to include contact information along with model # and serial # of your unit.