I am Vinod. I will try my best to help you resolve this issue.
Did you mean the phone screen is dark? I am not sure whether you have tried the reset procedure.
If not, press and hold the power button and the home button (button below the screen) together for 10-15 sec. You might get an apple logo
Does not work
Is the screen entirely dark or does it show up something?
it is dark ahd u faingtly make out an image of the buttons
may be the settings changed somehow. To make sure, let's connect the phone to the computer and try the reset again.
press and hold the power button and home button together until you see an apple logo
already tied the same
is your iphone showing up in itunes?
yes and I have tried rewstore
After restore, you will have two options - "restore from backup" and "set up as a new phone". which one did you select?
If you have tried the restore and if the screen is still dark, the phone needs a repair/replacement
Why are so many phones failing at the same time? No solution from Apple
What does that mean? Did you mean you have more and one phone with the same issue?
only 3gs have two one bad one not
If your phone is under warranty, you will get a free replacement, provided it has no water/physical damage. You can either take it to an apple store after making an appointment or call apple care 1-800-2752273, 8AM to 8PM CST