I have a hitachi 37inch telly last night it turned itself off n was fine but now it done it again n it won't turn on... plzzzzzzz help

If you have a rearprojection TV you might need a new bulb

Its just a flat screen TV don't think it is rearprojection... the make is hitachi serial num :

Don't post your serial number on here. That is specific to your TV and might be needed to get warranty work done on your TV.

What is the model number?