Original post and pics  on home.comcast.net. (Additions and edits by bloke.)

Before attempting any upgrades be sure to read your Warranty. Relevant sections are quoted below:

QUOTE

Be sure to remove all third party hardware, software, features, parts, options, alterations, and attachments not warranted by SONY prior to sending the product to SONY for service. SONY is not liable for any loss or damage to these items.
 
This Limited Warranty does not cover...damage due to...
(4) attempted repair by any party other than a SONY authorized personal computer service facility; or
(5) tampering with internal components.