My phone is stuck on a flashing apple logo after battery replacement.

"There are three things to try:

1. Holding down the hold (top) and home (bottom) buttons at the same time for about 8-12 seconds.

2. Doing the same thing while the phone is being powered

3. Doing a restore through iTunes: http://support.apple.com/kb/ht1414

If your computer is not picking up the phone, try doing step 1 while it is plugged into the computer with iTunes open

The first two will not delete anything. The third will if you have not done a back up recently. If you are on iOS 5 or later and have wifi at home, maybe you have been doing iCloud backups each night in which case you're in luck. Everything will come back to the phone."

Sounds like you need to buy a better battery

just let it charge for 30 mins...its because the battery is too weak...

Try this: Hold both the home and power buttons at the same time. When the Apple boot logo appears, let go of the power button but continue holding the home button.

"I will help you to solve your problem, don't worry just follow as I say.

1. Firstly it is not a big problem just do as I say.

2. Connect your device to the PC and then launch the iTunes software.

3. And then go for the option of 'Restore' in that iTunes.

But if your device doesn't respond to it.

4. Then try to update the iTunes software to latest version.

And using windows OS means you need to uninstall the whole previous version of software and need to download and install the latest version of it.

5. And if you are having the third party apps such as iPhone Data Recovery and etc are installed then it will object your phone to respond to iTunes. So you need to update your iOS software at any cost, which is the only way to fix iPhone stuck on Apple logo.

All the best"