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have u tried Pandora, different pobo, is it a slim, try a different battery, is the three prongs off the mobo connecting properly with the bat.
It's either a short or a fried mobo. I have the same problem with a mobo i have. Its been 1 yr and the mobo is just sitting on my desk. I cannot get it to turn on no matter what.
You can get a motherboard on ebay for pretty cheap. Alternately you could just buy a broken psp with a working mobo and take the mobo out of it. You don't need to go and buy a slim or 3000.
Broken psps on ebay go for about £50 here, and motherboards, very close to that
http://cgi.ebay.com/SONY-PSP-MOTHERBOARD-TA-081-PSP-FAT-NEW-MAINBOARD_W0QQitemZ110337788065QQcmdZViewItemQQptZVideo_Games_Accessories?hash=item110337788065&_trksid=p3286.c0.m14&_trkparms=72%3A1234|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A0|293%3A1|294%3A50Not really...
Yes really, search it into the UK ones, only people selling them in buy it nows (because they have hundreds) and they usually sell for about £50-£60