Dell PowerEdge 4300 Dell PowerEdge 4300 Systems Installation and Troubleshooti - Page 70

The computer periodically locks up, especially at different places and times in different programs. The computer halts in the middle of performing calculations or complex mathematical operations. The subtests in the Video test group verify the proper operation of the video controller and the video control circuitry installed in the computer. These subtests check for the correct operation of the readable registers in the video circuitry and the controller. They write, read, and verify data patterns in the cursor registers of the controller. The Video test group also tests all the video memory and provides additional subtests to test the color features of a color monitor. The eight subtests in the Video test group and the video functions they test follow: Video Memory Test Checks the read/write capability of video memory in various video modes. Video Hardware Test Checks the cursor registers and the horizontal and vertical retrace bit registers in the video controller. Text Mode Character Test Checks the video subsystem's ability to present data in text modes. Text Mode Color Test Checks the video subsystem's ability to present color in text modes. Text Mode Pages Test Checks the video subsystem's ability to map and present all available video pages on the screen, one page at a time. Graphics Mode Test Checks the video subsystem's ability to present data and color in graphics modes. Color Palettes Test Checks the video subsystem's ability to display all of the available colors. Solid Colors Test Checks the video subsystem's ability to show screens full of solid colors. Allows you to check for missing color subpixels. 5-16 Dell PowerEdge 4300 Systems Installation and Troubleshooting Guide