HELP: can't display in primary monitor manyways2006-01-13 22:54:36

When I changed monitor settings to secondary one, I can watch it on TV. However, I don't know how to switch it back. Right now, I can only use TV as my monitor. When I tried to hook up to a regular monitor, it can display boot-up processes and windows XP logo. then it shows a black screen. What did I do wrong to cause this problem?

你怎么改过去就怎么改回来

thanks for reply, however

Ok, unplug the TV-out cable, restart PC

did, but still nothing, what else??