I need to display a PowerPoint presentation automatically in a very large LCD with the file saved in some kind of memory disc/stick, meaning no computer involved.
You already did this - but are you sure your laptop is not set to go into standby or hibernate when you close the lid?
Sony bravia LCD tv's might do this but u should check there product line
No. In order to show a powerpoint, you have to be running the powerpoint program. That requires a PC. Monitors can not run programs.
