I changed the monitor setting from 16 Bit to 256 colours and now when I reboot the computer the monitor will boot up, windows 98 starts and then stops and goes to a black screen after doing a scan disc. I can not change back to 16 bit colour screen resolution.
What has happened to my BIOS or CMOS settings?

I am usins a AMD K6 / 2 - 450 processessor and 576 megs of Ram.
All information gratefully received
Geoff