Although your Toshiba portable computer appears to be on and running, there is no image on the built-in LCD display screen
Look closely at the LCD display screen. If you can see a faint image
on the screen, the display screen's fluorescent backlight may be turned
off. Shining a flashlight directly at the screen will make it much
easier to see whether or not there is a screen image actually present,
though not lit up. On most Toshiba portable computers, there is a small
plastic or metal pin near one of the LCD display lid hinges. When the
display lid is shut (closed), this pin is pressed against an internal
switch which turns off the backlight, saving battery power. You may be
able to turn the backlight on again by tapping this pin repeatedly. The
normal screen image will then suddenly appear, or re-appear.If
there appears to be no display image at all, the problem is probably not
related to the backlight. In this case, press and hold the Fn key and
then press the F5 key several times, pausing several seconds between
each keypress. This will cycle through several display output
modes: Internal, External, Simultaneous, and possibly one or two more.If
no image appears on the LCD display after cycling through the Fn-F5
sequence, try doing so with an external CRT monitor attached, if
possible. If you still see no image, on either screen, try restarting
the computer with the CRT monitor connected.If you see a screen
image that looks normal when the computer is first powered on, or when
you try to enter the BIOS Setup during the power-on sequence, it's
an indication of a software problem (a driver or an application
that's launched while the computer is loading Windows, possibly). Try
downloading the display drivers for the computer from the Toshiba
Support website, and then re-installing them.If the LCD screen or
an external CRT monitor is blank only while the computer is first
powered-on, but then works fine, it's probably not an indication of a
problem. Some models display no text or images during the startup
process. Additionally, installing some Windows Updates may delay the
appearance of the familiar Windows desktop.If there are blank
margins bordering the image on the LCD screen, launch the Windows
Control Panel, then double-click the Display icon. Click the Settings
tab, and then adjust the Screen Resolution setting until image fills the
entire LCD screen, which will cause the margins to disappear.If
the font size on an external CRT monitor seems too small for comfortable
viewing, try clicking the Advanced button on the Settings page, and
then adjust the DPI (dots per inch) value. Try 120DPI and 135DIP, to
begin with. Avoid changing the DPI to much greater values, in order to
avoid settings that will be difficult to change.
- Hold down the power button for approximately 10 seconds until the computer turns off.
- Verify that neither one of these keys are stuck in the down position:
the Tab key (arrows pointing left and right)
the tilde key ( ~ and ` characters)
- Turn the computer on.
- If
either of the keys above appears to be stuck in the down position, and
if the issue is not corrected by pressing these keys repeatedly, then
service is required.
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