Apple PC Compatibility Card 7-inch card - Manual (Page 192)

The resolution I want is not available (dimmed).
The BIOS has been instructed that the mode is not available. If you’re sure
your monitor supports the resolution, run the Install program again and use
the custom configuration option.
A menu item is not available (dimmed).
The mode or test is not available for the current configuration. For example,
aperture tests are not available if the aperture is turned off. CRT mode and
pixel depth are determined by the current installation, DAC type, memory
size, and memory type.
A FIFO test error occurred.
The effects of a bad command FIFO should be visible (for example, the
display may be blank or there may be “garbage” on the screen).
A quick memory test error occurred.
Run the Detailed RAM Test to confirm the error and identify the address of
the error.
A detailed memory test error occurred.
Run the Detailed RAM Test several times to confirm the error. Take note of
any messages and error codes that are displayed.
The DAC LUT test failed.
An error occurred while testing the DAC LookUp Table. The problem should
be visible on the top color bar of any 8 bpp mode.
A ROM checksum error occurred.
An error was detected in the ROM.
The draw sequence failed.
An error occurred in the draw engine. If the error is intermittent, there may
be a marginal RAM failure. The effects of this failure may not be
immediately apparent.
185 Configuring Video Software