Sony PCV-R545DS VAIO Computer User Guide (primary manual) User Manual page 25

This section describes how to solve common problems you may
encounter when using your computer. Many problems have simple
solutions, so try these suggestions before you call Sony Customer
Support. For more advanced troubleshooting information, see the
V AIO Digital Studio Computer Reference Manual. You can download this
electronic document from Sony's Web site at
http:/ /www. sony.com/pcsupport.
Check that the computer is plugged into a power source and that it is
turned on. Check that the power light is lit on the front panel of the
computer.
Confirm that a diskette is not in the diskette drive (unless you are
using a bootable diskette).
Confirm that the power cord and all cables are connected firmly, as
described on the color poster.
If you plugged the computer into a power strip or UPS, make sure the
power strip or UPS is turned on and working.
Check that the display is plugged into a power source and turned on.
Check that the brightness and contrast controls are adjusted correctly.
See the manual that came with your display for details.
Check that the computer is not in standby mode (see "Using the
Standby Function" on page 13).
See "Using the Application Recovery CD(s)" on page 31 of this manual.