If all of the games in your psp was gone, how will you restore it back?

sounds like you have a corrupted operating system.
try to re-flash the firmware of your psp.

You can Bring it to Gamestop and they should Replace it for you!

Unless you created a backup, they are gone. Sorry.

This article courtesy of Ehow explains how to get your PSP games back:

http://www.ehow.com/how_5697996_recover-deleted-files-psp.html

If this doesn't work then that means the games are gone for good.

turn of your psp
1.turn on the psp by holding the (R trigger) you will be in the recovery menu
2.scroll down to CPU SPEED and change the xmb to default and game to default
this should work

Note: only for version 5.03 GEN-BStep 1: go to restore default settings, psp will restart Step 2: go to themes, change the color to white Step 3: This is the tricky part... go to photos and press down(don't let go) then press x.., your psp suddenly crushes and restarts Step 4: run the 2 programs on the game folder ... CFWenabler then the 5.03 GEN-B Updater.... Your welcome...

Backup up your games on a PC. Then Format your memory stick and put the psp games back in the memory stick if this does not work try formatting your psp by entering the recovery mode HOLD R + HOLD POWER...
Go to advanced/advanced config/format flash 1 and reset settings

if this also fails try using another memory stick on your psp

You are going to need to reset the PSP. This can be donw by following the restore PSP function in the options menu

Did you mess with the flash0 or install a new firmware or theme? If you did then you probably just need to go back to the one previous. First check another umd to make sure.

1. go to the settings tab
2. go to system settings
3. scroll down until you see restore default settings