Psp No sound No LIght

You need to send your PSP to Sony.

That issue your describing is symptomatic of a damaged of motherboard.

Has The screen Completly Blacked out Buy a New Screen

Get a Magic Memory Stick from pspcustomfirmware.com

Try changing your homebrew FW in recovery menu (Hold R trigger when you power on the psp) and go to homebrew (it will say 1.5 or your current FW) pick the one thats higher.

If that dosent fix it you might need to upgrade your CFW.

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

http://www.llamma.com/PSP/PSPTearDown.htm

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.

You have a bricked psp. Either sony or pandora battery will resurrect your psp. If you wish to do that yourself. Refer to the link below. Good luck

http://www.fixya.com/support/r314189-wish_repair_psp_themselves_quoted

I 

Hi JTDB,

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.

Hey Dude,

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.