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Ok it sounds as if your friend has bricked your PSP.Please be careful when you are updating your PSP as this will brick your PSP.Let me give you a quick overview of what happens when your PSP updates,first of all your PSP will erase it's operating system and write a new Operating system, this is why it will not turn on completely if you lose power while it's updating.ONLY UPDATE YOUR PSP IF IT'S COMPLETELY CHARGED AND PLUGGED IN FOR SAFETY REASONS.I will not post the solution to this problem for it is too long to post up here, YouTube has many videos on how to un-brick your PSP.Best of luck, for the solution you can email me at firstname.lastname@example.org
You may need to replace the LCD screen. I have encountered this on several occasions and by simply replacing the LCD is takes take of the problem. If you are running the old style PSP you can buy a screen for about $25.00 US, if you need the newer "Slim" model the screen cost is about $53.00 US. The job is quite easy to do and if you buy the screen it usually comes with the special screw driver needed to remove the screws to take it apart. Let me know if you need help in locating the parts and assistance in repairing the PSP, I can help you start to finish. Regards, RSelvy
You probably either have a bad back light wich if you hold your psp up very close to a light you will be able to see the display or your screen and light have gone bad in wich case you can buy a new screen on ebay here is a link http://shop.ebay.com/items/_W0QQ_nkwZpspQ20lcdQ20screensQQ_armrsZ1QQ_fromZR40QQ_mdoZ
and here is a link on how to replace the screen
In order to do this you will have to void your warranty :\ but it should fix the problem
If it was plain water (and not salt water) then leftover moisture/condensation may be causing the problem. Try this... it sounds really wacky but it often works: put your PSP in a box full of uncooked rice, completely covering the PSP on all sides. Leave it in the rice for a good 12-24 hours. The rice wicks away the moisture inside sensitive electronics.
Turn off your PSP, Press and hold the R button, and power on at the same time. This may reset the PSP. If not, do you get any sound? Look at the Display real close and see if you are getting any graphics. If your getting sound, and you can see some graphics, you have a backlight problem. If you get no sound and cannot see graphic, then their is a high chance of your PSP being bricked. This means that you done something to interupt an upload or program in progress. The eeprom program is corrupted and the PSP will not boot up. The term Bricked, refers to your PSP being no better than a black Brick paper weight. I have heard of a repair for this called Pandoras Battery. I am not sure if the Pandoras battery really works to restore Bricked PSP's. It may be worth a try for you to take a chance on Pandoras Battery.
All things are fixable. Try going into recovery mode. This is done by Pressing and holding the R button when powering up the PSP. You then can press the brightness control button to see the firmware. This might help you reboot the PSP. If it is worst than this, you may consoder sending it back to Sony for repair, although they usually do not want to fix a Squooshed PSP. I would not tell them you Sat on it. You can call SONY support at 1-800-345-7669.
If you cannot get them to Repair it, you can check out my website, www.Playstationclinic.com . I can fix it for a very reasonable price.