Answer to: Apple logo then blue screenDon't worry, just follow these steps to fix iPhone stuck on Apple logo => First of all Start your Computer and then connect with Internet connection, now Download the latest version of the iTunes application => Now install the iTunes application in your System and connect your Device with computer via Data cable => Now connect your Device with iTunes application and then Tab on summary option, see in the left side bar of iTunes => Now Select restore option from iTunes and then confirm the Restore Message for better results. After this unplug your Device and Restart it Hope it helps.
Answer to: What should I do if my iPhone 4S has water damage?Once your iPhone fell into water, don't run it right now! You can keep it in the airtight containers with rice, which will dry it out. I have make my iPhone work normally in this way. Besides, if you found some data loss due to water damaged. You can use FonePaw iPhone Data Recovery to get back your lost data in 3 ways.
Answer to: Problem with restoring to Factory Settings and Apple Logo loop?If you are in need of resetting a iPhone, you can use iTunes to make it true. Step 1: Connect your iPhone to the computer via USB cable and select "iPhone" from the toolbar. Step 2: before continuing, click the "Back Up Now" button to ensure your device is backed up before the restore. Step 3: Hold down the "Shift" button and click "Restore iPhone". Step 4: Select the firmware ipsw file from your hard drive in when there is a pop-up, then click "Open". Step 5: iTunes will ask you if you want to restore the iPhone to its factory settings. All of your media and other data will be erased. Click the "Restore" button to continue. Step 6: Wait till the process complete. After resetting your iPhone, if you found some data are lost, you can use FonePaw iPhone Data Recovery to recover your lost data, if you have backed up iPhone data to iTunes or iCloud before.