when i start my computer i see the toshiba screen then the windows 98 then i wait and after the computer has finished registering the screen is blank and i cant see anything, but when i press keys a ding sound is made. I am not taken to my windows user log on screen.

This problem occured when i switched my 256 color display to a 16 bit display, and restarted the computer since i restarted it the screen has remainded blank

if anyone can help me please reply