the SZ series is notrious for having a crappy trackpad - I struggled with mine for years - sent it back to Sony and they said that I needed a new motherboard.
Yeah, right... to fix the track pad.
Well I saved the $699 - and did the black tape fix, and smooth sailing since.
http://doube.org/sztp.html
I am hitting all the forums Sony, so hope you read this. This is the only recourse I have for you having tried to jack me for 700 dollars.
This computer is finally operating properly after years. I so wish I had done this earlier. You made me reinstall my system software, all of my software, send the computer in for days - costing me days of downtime - and then refuse to fix a computer that is under warranty -
You tell me that you need to replace the heat sink, mohterboard, fan, and charge me more than the unit is worth to fix your faulty hardware.
Good times.