I plugged a wired monitor monitor into my laptop but it only worked for a minute?

When I checked in device manager there were only wireless choices as default not wired. It did work for a minute but now it looks like the laptop is not detecting this hardware. There's a green light lit up whre I plugged it in. It is not usb but regular fitted plugs with spikes. Laptop is ibm thinkpad. Monitor is ibm thinkvision.

Yeah

Use the function key and F5 or F6 key with a coloured square

Fn + F5 and a menu with 4 options should appear
if windows vista or win 7 you can use
the windows logo key + P to get the same menu up

Very vague on the details here so I will do the best I can.
If you are running windows Vista/7:
- Right click any blank area on the desktop (Not on an icon/shortcut)
- Click on screen resolution
- A dialogue box will open that will allow you to set up all connected display devices.

If you are running windows XP:
- Right click any blank area on the desktop (Not on an icon/shortcut)
- Click on properties
- Go to the "settings" tab
- You can manage your connected displays from here.

Make sure that you keep an eye out for a keep these settings message box so the computer doesn't switch back to the initial settings before connecting the display.

Also, make sure that your graphics driver is up-to-date