It appears that Sony has made a big boo-boo according to the company's website. A notice was found that states four models of their S-series Vaio computers have a severe defect. The systems can possibly have two different problems: either they will randomly shut down or fail to boot completely. The affected models are:
If your computer happens to be one of these models, you should contact a Vaio service center immediately. Sony will be extending the limited warranty on the affected motherboard up to 24 months, along with replacing it free.
Sony Vaio S-Series have some problems [blog.PCNews]