DIY repaired iPhone won't boot fully - flashes Apple logo when powered via USB
Get into DFU mode and do a restore in iTunes.

For DFU mode:


Turn the iPhone off (not needed in this case :)
Push the sleep button for 3 seconds (Apple logo should appear)
Push both buttons for 10 seconds (Apple logo should disappear)
Release the sleep/wake button and hold the home button for at least 15 seconds.


Nothing will show up on the screen, but if you connect it to iTunes it should recognise it. Then do a full restore.

If that doesn't work, you screwed something up inside, you might want to open it up again and re-check all connections.