I would say that it is very likely your laser, unless it stopped working first thing after an update.
Does it still read any media eg. cd,dvd??
If you have a warranty still i would suggest to send it in to sony, if not it is much cheaper to replace the laser yourself than pay for an out of warranty repair.
mine just did the same thing, but it was right after the 53 update... sony won't take responsibility for it but I've seen that there are alot of people who've had the same problem after the update... ideas?