Got my EDV4100 home cinema theatre kit in April, and it's been pretty straightforward until today, pretty much six months to the day since I bought it.  Unfortunately, I think I've now fallen foul of a software update failure.

Since I tried to turn it on to watch TV five hours ago, I can't get it to do anything.  The remote control is useless. The buttons on the front of the machine do nothing, apart from the eject button, which sends out the DVD tray but won't take it back in.  The white LED light on the front blinks stradily on and off, about once per second, and while the display reads "TV", as it would when it was playing sound from the TV, no sound is coming out.  I even hear the speakers make the little pop noise they make before they spring into action, but nothing happens.  It's like it's frozen, before eventually it eventually puts itself into standby and powers down.  Turning it back on just starts the cycle all over again.

I've tried power cycling it by unplugging it for three minutes, but nothing has happened.  I've taken out all the cables and checked them, including the TOSLINK, but nothing changes.

There's not a problem with my Sony TV, which is displaying picture perfectly  I've got a signal splitter which goes to the LG TV in the kitchen via an HDMI, and that's playing both sound and picture.

The annoying thing is that since both devices are Sony, the compatibility which lured me to the Sony Home Theatre brand is now working against me, as I can't hear any sound from my Sony TV.  I'm having to increase the volume from the LG TV and blast it into the living room, which is going to make me very unpopular with my neighbours.

Can anyone suggest what might be going wrong?