I have gone thru the following steps:
Try to find an answer by searching the Web or this forum.
Try to find an answer by reading the manual. (it's here: http://www.playstation.com/manual/pdf/PSP-1001K_1.pdf )
Try to find an answer by reading a FAQ.
here's one: http://www.pspupdates.com/forum/showthread.php?t=2323
Try to find an answer by inspection or experimentation.
Try to find an answer by asking a skilled friend.
If you are a programmer, try to find an answer by reading the source code.
I still cannot find a fix to my problem, which is that I get no sound when headphones are inserted. When headphones are not inserted, the sound is fine. I have tried removing the UMD, the memory card, the battery, pretty much all of the simple things like that.
Any suggestions would be VERY appreciated, thank you.
Also, if it turns out that I have to send my PSP to Sony for servicing, what are the chances that they are going to muck about with my 1.5 firmware?
Thanks in advance.