help with psp memory stick

when i was putting games on my memory stick my pc said i needed to format it. instead of me formatting it, my impatient cousin took the psp out of usb mode, and the psp wouldnt read it. i tryed to make it go back into usb mode but it keeps saying that no memory stick is inserted.
the memory stick is a 4gb memory stick pro duo.

 

If you have a memory stick card and a card reader try that and reformat the stick.


And next time, before adding games-use the psp's internal memory stick formatter do it so it adds in the folders

 

thanks, but ill have to find buy another pro duo card reader though, are you sure this would work based on personal experience?? i just wanna know because i dont want to buy a card reader and then have to come up with 30$ for a memory stick...