My iphone 3g was freezing so i started to reset it and now it wont even turn on. any suggestions?

my iphone 3g was freezing on the text message screen so i tried to reset it by holding the top button and the home button. now it wont even turn back on. the apple logo comes on then turns off 10sec lter. any suggestions?

When the iPhone only shows the Apple logo and then turns off, it usually indicates an issue with the software that is preventing the phone from completing it's boot sequence. This can be remedied by putting the phone into DFU mode and restoring it. By restoring the phone, the software and firmware will be removed and replaced with a fresh set and the content will be removed from the phone and need to be resynced.
To put the phone into DFU mode:
1. Make sure the phone is connected to the computer
2. Hold down the sleep/wake button and home button at the same time for 8 seconds
3. Let go of the sleep/wake button and keep holding down the home button
4. If you are successful, a dialog box will pop up in iTunes stating that iTunes has detected an iPod/iPhone in recovery mode and the phone's display will remain black.
5. Click OK, then click the restore button in iTunes.
Hopefully after that, the iPhone will be up and running so you can sync your content back.
I hope this helps!

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