Toshiba Satellite C650 Maintenance Manual page 111

3 Diagnostic Programs
If press Ctrl+Break to force the test to terminate during execution of VESA
Video Memory, the test program will not operate and display properly in further
tests.
Subtest 05 AGP Test
This test item is to report the system's Accelerated Graphics Port status and check
whether AGP registers works normally.
Subtest 06 LCD Panel Test
This test item is to check whether there is any fault in its resolution by displaying
the RGB gradient color screens.
Satellite/Satellite Pro/C650/C655 Maintenance Manual
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3.8 Video