I have a SONY PSP 2000 and the buttons wont work??

you could try this link and see if it helps you to find out why its not working.
Home Button on PSP Slim PSP 2000 not working Google Search

try removing the battery then reinsert battery if does not resolve call sony at 1-800-345-7669

ALL YOU HAVE IS TO CHANGE THE FLEX CONTROLLING THE HOME,VOLUME,SELECT,START BUTTONS.

Hi, I've had the same problems for about a month now. I have a psp fat (psp-1000) with cfw. 5.50. I was playing ZHP unlosing ranger when the same thing happened.
I use the lowest brightness setting to lengthen game play time. I keep using the audio button (The one you hold and turns the sounds mute or back.. right?) for the game then when i reset my game (press home and start the gameover..) the brightness suddenly keeps on changing even making the whole screen black. After 5 minutes? it stops but then when i press the down or square, triangle button the brightness changes sometimes thats the only thing the button does.. i found a temporary fix for this, i put it sleep mode then turn it on again and it stops.. the buttons go back to normal, for a while.
It goes on and on even with other games. It just stops after 10 minutes later or more than starts happening again everytime the brightness or audio button is pressed.
We scanned it for viruses on a computer and it just kept on blinking everytime it responded to the scan. No virus were found but after that when we disconnected it from the computer the brightness problem stopped for a good long time.. we avoided pressing the brightness and audio buttons. but recently its happening again.
and now just got worse. I was playing Socom Fireteam, and when you accidentaly go to the start menu, you have to press "select" to exit and continue the game. But the "select" button wont work!
so i quit the game and startover.. when this happened for the 3rd time. When i pressed "home" button and was asked if i really wanted to exit the game i couldnt move to "yes" and couldnt press the "O" or "X" buttons.
So i turned off my psp and when it went back on, I couldnt press anything anymore. except, the volume buttons and select (the vsh menu appears)
I searched for help from the internet, found "disable your vsh menu" remedy.
It worked! but when i played the game, the "cwcheat" menu keeps on appearing (seplugin that appears when you press select button). It wouldnt stop >.<
So we disabled that too.
Now playing God of War Ghost of Sparta, and one part, the start menu kept on appearing! we'd close it so that we could push one of the levers in the game but then it pauses the game again.. it stopped after a while. then it happened again only slight.
Found a comment on a "select button problem" and it said that it was the:
"parts that were Ribbon style, with it was the start and select button and the volume/sound" he had that parts?
found same problems around the net, some posts from 2009.
found decent posts and solutions here:
http://forums.qj.net/psp-general-help/151111-psp-slim-start-button-stuck.html
the best one says buy a new "flex bar" or "home bar". It goes by many names, but it's the metal bar that has all of the bottom row buttons on it (home -> start) It's usually under $10 USD and obviously the right thing to do.
got another comment that says it worked from him when he bought one himself.
Glad I found others, and that I could share this.. wish it makes things better.
Hope it works out for all of us!
Another thing, Merry Christmas!

try dismantling your psp and see the inside of it, you said you cleaned the buttons. try to see if the chips inside the psp are sort of dirty and stuff, the access points in wear the buttons touch, if this still doesn't work, just go to a original SONY STORE.

how do you knw that the select button is not working?in most psp games the select button has no function even in the xmb menu there is no function for it.maybe youor select button is stil good.

Press Hold Triangle Square Select Start at The Same Time and the Power Button and you should see the initial setup;and then you can recover the settings of your PSP :) ,hope it'll work ;)

the control chip under the button isnt making contact with the plastic button,, easy fix, take the cover off the psp clean the buttons with a pencil eraser and put the cover back on (without screwing it down) check for contact,,,,if it works then screw it back together if it doesnt then pop the cover off and put a small piece of tape on the select button its self to make up for the slack). Hope this helps you out..it worked for me!

the only thing u can do is press the "R" button along with the powe button for about 7 secs then release both buttons ...but wonder why its not working ..... i guess its time to bang ur psp dude...thats the only solution cause sony sucks.....

If it’s the 2000 series (PSP Slim), then yes. Connect your PSP system to an available USB port on your computer. Turn on your PSP, then under “Settings“, select “USB Connection”. Your PSP should connect to your computer and start charging. It may take awhile, but it will charge it all the way. Hold the display button (The button with the rectangular shape at the bottom of your PSP) until the screen goes black. This will speed up the charging process and is a good method of prolonging battery life when listening to music or other things.

If that doesn’t work, try looking for an adapter lying around your house that matches the volt numbers. The PSP takes 5V. Most portable CD players use 5V adapters and are usually the same size as needed for the PSP. I suggest using an adapter that matches the volt number and fits without trouble. If the orange light doesn’t come on or the PSP acts weird after charging, I’d stop using the adapter. Ask me any questions if you have any. ;)