I wrote a post that explains what to do when the iPhone is Stuck On Apple Logo: http://blackbox-iphone.com/index.php/how-does-it-work/25-BlackBox/81-What-to-do-when-the-iPhone-is-Stuck-On-Apple-Logo Good luck!

This guide will teach you how to fix error 3194

I wrote a short guide that explains how to fix error 3194: http://blackbox-iphone.com/index.php/how-does-it-work/25-BlackBox/79-How-To-Fix-Error-3194

You can also fix error 1015 by following this guide: http://blackbox-iphone.com/index.php/how-does-it-work/25-BlackBox/84-How-To-Fix-Error-1015