Did u put it in your comp and format it either automatically or by your self if it asked if u wanted to, or it is one of those bad memory cards from china which people have been having trouble with such as myself i just got an memory card 4 my sony psp and it said like yours did no memory stick inserted. "either one will mess you up... not literal just mind wise. if i were u i would get a name brand one try looking online at different rated one and comare the different peaples cons and good things bout each one, and ur welcome
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Welcome to Fixya
As part of the test. Try to copy files (pictures) to the device and see if the device were able to save the file. If not then try to format the device. Please take note that formatting the device will delete everything. see procedure below:
1. press menu
2. using the jog lever, select format
3. press enter
4. use jog lever and select yes
5. press enter -> Ok? -> press enter
6. formatting will be displayed on the screen. press menu after formatting the device and test the issue.
Thank you for using Fixya!
2 Press ^/V to select
"Format" and press >.
The window for selecting the
memory to be formatted is dysplayed.
^/V Select Built-in or MemoryStick
and press >
the window for executing format is displayed
^/V Select execute and then press >
The confimation window is displayed
^/V Select "YES" and press >
After you done press  STOP to return to normal Display
Essentially you just plug in the Memory Stick, wait for the display to stop showing "ACCESS". Make sure you do not insert the stick when you are either recording or playing a message. There is a chart that shows you how many messages you can record using the different speeds.
Display the folder o message in the folder that you want to erase.
Press Menu and select Erase by using up arrow down arrow and then press play stop button, the cursor moves to erase menu.
Press up arrow down arrows to select erases all the messages or message in a folder.
Press up or down arrow to confirm say yes and press play
Press stop to exit.
Sony has posted the intructions at
The steps aren't very intuitive and they are not in the cocumentation that came with my unit.