Console Screen Not Working

[MikeFe]

I have an IS250SE, 2008.

Yesterday it wouldn't start - everything completely dead.

Called AA - they tested the Battery. It showed 3-4v. They jump started it and it started fine, and it re-starts fine too.

However the centre console screen, and the buttons around it (satnav, air con, phone etc) are all non-responsive.

Everything else seems ok - even the radio & CD works, just the screen is blank and the buttons don't work.

The fuses under bonnet and in the fuse box in the drivers footwell are all ok.

Any ideas what else it could be before it goes into the Lexus garage?

Thanks

Mike