when i am playing games, my psp keep poping up msg sy "are u sure u want to quit the game?", ie the msg that pop up when u press "home" while playing...And when i power on my psp, it'll load for 1 minute then says "no disc are found", before the wallpaper and time appear. I found that after i open the umd drive, the problems stop. Is there anything to do with setting problem? My psp is lite one. Never fall or soak in water. Need help!

u are kinda unlucky actually.... from my experiance. i found three psp with that problem...
manage to repair 2 of it, but the other 1 no luck at all..

i can guarentee after a month the problem will be worst, the 'home' button will keep pop up frequently.. and weird short circuit will happen.

discuss it here in my thread, i can teach you step by step how to open the psp... you should check the mother board

http://forum.lowyat.net/topic/775275
btw, have you ever wipe your psp with damp cloth?
sometime water will get in the home button strip

Considering wetfusion is willing to help you this problem, and is redirecting you to his thread instead, I'm closing this.

Thanks.