How do I reformat the memory stick on my Sony Cyber-Shot DSC-P200?

Actually, Sony has a good support site where you can thankfully type in your model number rather than trying to navigate through their impressively large range of different products. I did just that, typing in DSC-P200, and immediately got the following set of frequently asked questions:

As you can see, you're not the first to ask this particular question. Click on How to format the Memory Stick or disc and you find that ... it doesn't actually lead to an article, but instead to a search of the entire Sony knowledge base, with 76 matches. Ugh. Indeed, the #1 match talks about networking errors you can encounter with your Sony PSP, of all things.

It's buried in the results, but one of the articles there is How to format the Memory Stick media in the camera [hopefully that link will work for you too. It's article #C400281].

That document explains that you format the memory stick - which will delete all pictures stored on the device as part of the process - by doing the following:

1. Insert the Memory Stick media® to be formatted in the camera.
2. On the camera, turn the MODE DIAL to the SETUP position.
3. Turn on the camera.
4. Using the CONTROL BUTTON, press the DOWN ARROW button to select MEMORY STICK TOOL.
5. Press the center of the CONTROL BUTTON.
6. Press the UP ARROW or DOWN ARROW button to select FORMAT.
7. Press the RIGHT ARROW button.
8. Press the UP ARROW or DOWN ARROW button to select OK.
9. Press the center of the CONTROL BUTTON.

Hopefully those instructions will help you get going again with your Sony digital camera. Good luck!