Display, Why did my screen go blank – Sony VGN-SR490DDB User Manual

VGN-SR490PBB, VGN-SR490D, VGN-SR490JCP, VGN-SR490DBB, VGN-SR499DBB, VGN-SR490DAB, VGN-SR490PAB, VGN-SR499DEB, VGN-SR490PDB, VGN-SR490, VGN-SR420J, VGN-SR499DCB, VGN-SR490JCH, VGN-SR499DDB, VGN-SR430J, VGN-SR490Y, VGN-SR490JCW, VGN-SR490JAB, VGN-SR490JCN, VGN-SR490J, VGN-SR490DCB, VGN-SR490JCB, VGN-SR490DEB, VGN-SR490JBB, VGN-SR410J, VGN-SR499PCB