Toshiba Techra R840 will not turn on; have tried the recommended battery removal process and nothing. The power light (yellow) and battery light (orange) come on and remain on, and the light second from the right flashes when I press the power up button (it looks like audio or signal out symbol?) Nothing at all - no sound, no screen activity whatsoever, no noise, no fans nothing. It is a couple of years old but rarely used. Thanks for any advice.