So, let's say you're experiencing a boot loop and want to get an idea of what's going on "under the hood". It can't hurt to peek with adb logcat. Even if it just looks like gobbledygook, you can copy and paste the output (usually the errors will be obvious if you sit down and look-- stuff like "ERROR!!!!!" may appear) to a site like pastebin.com (although make sure that you're not pasting personal information such as local network addresses or anything sensitive, which occasionally will appear in the log).