I have the regular nintendo ds.Oneday i go turn it on and screen

Naa got to get a top screen they come with the ribbon cable no way around it they are cheap have a look on ebay u can get them for abt $10 delivered

it's likely that the top screen ribbon cable has either become damaged or loose, the entire top screen will probably need replacing (along with the casing if the hinge is broken).. if you are not confident with technical or fiddley things I wouldnt recommend attempting it yourself.

check if it is charged

sounds like possibly the ribbon, should get it checked incase it dies for good.

Ok I found the wire. Click Here to buy it.

ITS AN INTERMITTENT CONTACT with the ribbon belt that connects from the main unit to the upper screen , I believe you need to take the DS for an authorized repair shop, but before doing anything , give a call to a tech support at NINTENDO , THEY would gladly help you out and inform you whats the next step , hope this helps , AJ , in case you dont have the LINK, let me give it to you : http://www.nintendo.com/consumer/ ,
hope this helps AJ

I'LL SAY ITS BROKEN YOU NEED TO REPLACE IT

Hello,

Time to use your ultimate majestic warranty now

Nicholas

Hi, replacing the original nds upper screen is a fairly straight forward procedure, you need to remove the 4 x small plastic plugs located in the corners of upper screen, then remove the 4 x phillips screws, the top outer back part of the case will seperate and you can gain access to the screen. Firstly remove the small screw holding down the right hand pcboard to gain access to the ribbon connectors, release the larger flat connector by hinging the clip up, slide the ribbon out, underneath you will see a tiny connector, gently ease the small clip back towards the ribbon, prising a little each side at a time, remove the ribbon and then you can prise the screen from the case.
These guys sell the replacement screens www.ps2laser.co.uk prices are very competitive and offer next day delivery!

i had the same problem  but it was blue tint shortly after the ds would turn on flash then turn off turned out to be the wire ribbon to top screen:: needed new top screen!!