How to fix my Logik TV please?

Last night my Logik 40" TV (purchased new in 2011) went funny. When switched on, the Logik screen appeared - then went black - then went pink and stripey - then went black. After switching off and on several times, checking everything at the back was plugged in etc, sometimes the black screen would temporarily show a small or smaller rectangle of colour. Tried it again today and it alternates between the Logik screen and the black screen, with the on/off light changing itself from red to blue at intervals. Can it be fixed? Any help greatly appreciated - thanks in anticipation.