my iphone works but the screen is black

Hi terryrbirch,

Welcome to the Support Communities! The article below will help you troubleshoot the issue you are having with your iPhone only showing a black screen:

iPhone: Hardware troubleshooting

http://support.apple.com/kb/TS2802

See the section entitled "Display has no backlight or dark screen" for some troubleshooting steps.

I hope this information helps ....

- Judy

If your iPhone 4 screen goes black but still working

1.Press home button and power button for 10-15 seconds and release.

(you will see an apple logo)

2.Connect your iPhone to iTunes

(go to restore iPhone)

*If you have find my iPhone on or if you do not know password it works

3.Go through process and restore your phone.

(it will take you like 1 hour to restore you iPhone)

4.If you want a latest IOS version you can install it there

After that you will get a new fresh iPhone