Which resolution did you change? Was it for the external Display (2nd monitor) and does the vga port support component RCA
Presuming XP then rightclick on Desktop |Properties | settings and click on the Advanced button | Click on the tab designated for your computer’s graphics card. Look at options available in the display settings. See what you can change the VGA output to and try different settings.
It would seem you need to buy an adaptor to convert your vga to rca www.ehow.co.uk
"Toshiba laptop computers can connect to an external monitor for viewing on a larger screen by hooking up a VGA (video graphics array) cable from the port on the computer to the monitor. Connecting a Toshiba to a TV with RGB (red, green blue) component video jacks requires an adaptor available from electronics and computer stores. The adaptor unites the two different types of video cables and converts the VGA signal into a digital RGB signal that can be processed on the TV."
Here is an example of the adaptor available on amazon.co.uk price £13.99 with free delivery
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