I have a Sprint LG model# LS670.
When turning on the power it just displays the Android logo in a loop.
How do I factory reset it?
Had the same problem. Started 1.5 months ago and after rebooting 5 times and taking it to the store (they charged it only) it worked well until today. I took it back to the store and they told me I needed to replace it. They placed the order for a new phone that will not arrive until next week Tuesday. Well I read in a blog of LG4 with different carriers not to give up with rebooting that is what I did (including removing the memory card - sometimes the cards get corrupted), I must have rebooted about 12 times and now my cellphone works again. I was able to back up all my pictures, videos, etc. Guys, do not give up rebooting. I know now this will happen again therefore ordering a replacement is just a matter of time. At least back up all the files you want on a weekly basis.