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Diagnostic Video Tests: Dell OptiPlex GX1 Small-Form-Factor System User's Guide
file:///C|/infodev/2013/eDoc/OpGX1/UG/viddiag.htm[2/21/2013 11:47:27 AM]
Video Memory Test
The Video Memory Test verifies the integrity of the video memory either on the system board or on a video
expansion card. As the test runs, it describes which 64-kilobyte (KB) block of video memory is being tested.
When a test is complete, a message indicates whether the video memory has passed or failed the test. This
test does not require any interaction on your part.
Video Hardware Test
The Video Hardware Test verifies the operation of the cursor registers and the horizontal and vertical
retrace bit registers. When a test is complete, a message indicates whether these registers have passed or
failed the test. This test does not require any interaction on your part.
Text Mode Character Test
The Text Mode Character Test consists of a group of subtests that display printable characters and
character attributes. The subtests check character quality and the monitor’s ability to display the characters
correctly on its screen. A prompt at the bottom of each screen asks the user to decide whether the display is
satisfactory and to respond by typing y or n.
If you respond affirmatively to each subtest, the Text Mode Character Test passes. A negative response to
any subtest causes the test to fail.
The following subsections describe the subtests of the Text Mode Character Test in the order in which they
appear:
Character Attributes Subtest (80 x 25)
Character Set Subtest (80 x 25)
Video Scan Alignment Subtest
Character Attributes Subtest (40 x 25)
Character Set Subtest (40 x 25)
Character Attributes Subtest (80 x 25)
The 80-column x 25-line character attributes subtest displays four lines of text that demonstrate normal-
intensity video, reverse video, intensified video, and blinking video. Figure 1 shows an example of the 80-
column x 25-line character attributes subtest screen.
Figure 1.
80-Column x 25-Line Character Attributes Subtest Screen