Autodetect is not working for that monitor. The easy way is to see if there is a driver for your monitor that you can install (from the monitor manufacturer's website).
The hard way is to go into your registry settings and force a set aspect ratio, which will then allow you to select a compatible resolution from the menu.
Thanks for the rapid response.
word just in, his monitor is actually a TV.
The registry way sounds the best. can damage be done to his monitor. I understand damage can be done to his PC is done incorrectly.