Sony PCV-RS310 - Manual (Page 41)

Upgrading and Maintaining Components 27
5 When the screws are removed, the cover is released. Slide the cover
towards the back of the unit to remove it.
Removing the cover
!
If you remove the cover immediately after you shut down your computer, the
components may be too hot to touch. Wait until the internal parts of the
system unit cool down before you attempt to remove the cover.