You could run MemTest 86,
www.memtest86.com , from a bootable CD you would need to create.
You could run HDD diags. Sony might have them. Otherwise, pull the HDD, then go to the HDD's web site.
You could create an UBCD [
www.ubcd4win.com ] to harvest any data. Lots of diags on the disk, too.
Have you a product information page? I can't find one at sony.com.
RF123