I dont really know if it is smething so please dont blame if it is not!
A few days ago i read about some secret position on the power switch that no one new how to use. There were no discription for how to put it the power switch in to that position so i just started to experementate.
What i found out was a little surprising for me cause i never heard about this.
The thing is that if you put the switch in to position between normal position and the hold position and turn on the usb mode PC wont recodnise our PSP as it usually happens it will say that it found a new device without a driver for it. At ferst i fought that it was just a bug on my PC but then after doing it a few times i understood that it is not.
So this is presisly what i did to jet that.
-first i turn my psp on
-then i go to system menu
-then i put my psp in hold mode
-then get the swith nearly to the normal position so that in hold sercle i can see like 1% of that yellow that i normally see (this is not so easy to do so it doesnt worck all the time)
-then turn the usb mode on
I hope this can help
p.s. Sorry for my english i am from Russia