For reasons best known to itself, my machine (IBM Aptiva P75) resolutely refuses to go above 256 colours. The "help" says that more colours are available depending on the display adapter and the monitor. I know it isn't the monitor as I've had more than 256 colours before, I also have the correct driver. I'm not sure which display adapter I should I should have as my monitor manufacturer isn't listed as a choice in the display adapter list. I tried a few display adapters at random but it made no difference - in fact in some cases, I was left with 16 colours ! I also have no driver disk. The monitor is a Tatung CM-14UHR.
Not sure if it is related, but on the Settings tab of Display Properties, the advanced button has been replaced with something else - something like "change monitor".
Any ideas people?